Patch for "master" branch: https://reviews.mahara.org/8024

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https://bugs.launchpad.net/bugs/1560739

Title:
  Can't build CSS if you have npm gulp-bless version 3.1.0

Status in Mahara:
  In Progress

Bug description:
  If you have the npm package "gulp-bless" at version 3.1.0 (which
  requires the "bless" package at 4.0.0), then Mahara's SASS compilation
  (make css) will error out.

  To replicate:

  1. Clone a new Mahara repository, or in an existing Mahara repo rename your 
"node_modules" directory to "node_modules.bak"
  2. Run "npm install" in this repo
  3. Run "make css"

  
  Expected result:
  Successfully builds the CSS, with this output.

  (master)aaronw@vegas:~/www/mahara$ make css
  npm install
  npm WARN package.json mahara-themes@1.0.0 No repository field.
  npm WARN package.json gulp-minify-css@1.2.4 No repository field.
  Building CSS...
  [13:21:16] Using gulpfile ~/www/mahara/gulpfile.js
  [13:21:16] Starting 'css'...
  Compiling CSS for htdocs/theme/custom
  Compiling CSS for htdocs/theme/default
  Compiling CSS for htdocs/theme/modern
  Compiling CSS for htdocs/theme/ocean
  Compiling CSS for htdocs/theme/primaryschool
  Compiling CSS for htdocs/theme/raw
  Compiling CSS for htdocs/theme/subthemestarter
  [13:21:21] Finished 'css' after 5.72 s
  Done!

  
  Actual result:
  Errors out with this output.

  (master)aaronw@vegas:~/www/mahara-test$ make css
  npm install
  npm WARN package.json mahara-themes@1.0.0 No repository field.
  npm WARN package.json gulp-minify-css@1.2.4 No repository field.
  Building CSS...
  [13:22:42] Using gulpfile ~/www/mahara-test/gulpfile.js
  [13:22:42] Starting 'css'...
  Compiling CSS for htdocs/theme/custom
  Compiling CSS for htdocs/theme/default
  Compiling CSS for htdocs/theme/modern
  Compiling CSS for htdocs/theme/ocean
  Compiling CSS for htdocs/theme/primaryschool
  Compiling CSS for htdocs/theme/raw
  Compiling CSS for htdocs/theme/subthemestarter

  events.js:72
          throw er; // Unhandled 'error' event
                ^
  TypeError: Cannot call method 'reduce' of undefined
      at countRules 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/count.js:26:18)
      at count 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/count.js:44:14)
      at chunks$ 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/chunk.js:52:46)
      at tryCatch 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/node_modules/babel-runtime/regenerator/runtime.js:72:40)
      at GeneratorFunctionPrototype.invoke [as _invoke] 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/node_modules/babel-runtime/regenerator/runtime.js:334:22)
      at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/node_modules/babel-runtime/regenerator/runtime.js:105:21)
      at chunk 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/chunk.js:98:113)
      at Object.chunk 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/index.js:34:33)
      at Transform._transform 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/index.js:33:36)
      at Transform._read 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:184:10)
  npm WARN package.json mahara-themes@1.0.0 No repository field.
  npm WARN package.json gulp-minify-css@1.2.4 No repository field.
  [13:22:46] Using gulpfile ~/www/mahara-test/gulpfile.js
  [13:22:46] Starting 'css'...
  Compiling CSS for htdocs/theme/custom
  Compiling CSS for htdocs/theme/default
  Compiling CSS for htdocs/theme/modern
  Compiling CSS for htdocs/theme/ocean
  Compiling CSS for htdocs/theme/primaryschool
  Compiling CSS for htdocs/theme/raw
  Compiling CSS for htdocs/theme/subthemestarter

  events.js:72
          throw er; // Unhandled 'error' event
                ^
  TypeError: Cannot call method 'reduce' of undefined
      at countRules 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/count.js:26:18)
      at count 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/count.js:44:14)
      at chunks$ 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/chunk.js:52:46)
      at tryCatch 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/node_modules/babel-runtime/regenerator/runtime.js:72:40)
      at GeneratorFunctionPrototype.invoke [as _invoke] 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/node_modules/babel-runtime/regenerator/runtime.js:334:22)
      at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/node_modules/babel-runtime/regenerator/runtime.js:105:21)
      at chunk 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/chunk.js:98:113)
      at Object.chunk 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/bless/lib/index.js:34:33)
      at Transform._transform 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/index.js:33:36)
      at Transform._read 
(/home/aaronw/www/mahara-test/node_modules/gulp-bless/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:184:10)
  make: *** [css] Error 8

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