Added a missing cause exception in .get_optional_template

Project: http://git-wip-us.apache.org/repos/asf/incubator-freemarker/repo
Commit: 
http://git-wip-us.apache.org/repos/asf/incubator-freemarker/commit/2a774e59
Tree: http://git-wip-us.apache.org/repos/asf/incubator-freemarker/tree/2a774e59
Diff: http://git-wip-us.apache.org/repos/asf/incubator-freemarker/diff/2a774e59

Branch: refs/heads/2.3
Commit: 2a774e5911217b6353eddd248c6a26e6152e6b2c
Parents: 2a2a4e7
Author: ddekany <[email protected]>
Authored: Mon Mar 26 21:36:24 2018 +0200
Committer: ddekany <[email protected]>
Committed: Mon Mar 26 21:36:24 2018 +0200

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 src/main/java/freemarker/core/GetOptionalTemplateMethod.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/incubator-freemarker/blob/2a774e59/src/main/java/freemarker/core/GetOptionalTemplateMethod.java
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diff --git a/src/main/java/freemarker/core/GetOptionalTemplateMethod.java 
b/src/main/java/freemarker/core/GetOptionalTemplateMethod.java
index c6ba7f3..15ea527 100644
--- a/src/main/java/freemarker/core/GetOptionalTemplateMethod.java
+++ b/src/main/java/freemarker/core/GetOptionalTemplateMethod.java
@@ -138,7 +138,8 @@ class GetOptionalTemplateMethod implements 
TemplateMethodModelEx {
             template = env.getTemplateForInclusion(absTemplateName, encoding, 
parse, true);
         } catch (IOException e) {
             throw new _TemplateModelException(
-                    "Error when trying to include template ", new 
_DelayedJQuote(absTemplateName));
+                    e, "Error when trying to include template ", new 
_DelayedJQuote(absTemplateName)
+                        + "; see cause exception");
         }
         
         SimpleHash result = new SimpleHash(env.getObjectWrapper());

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