Provide a 'required' attribute to ivy settings/properties element to control 
reaction to missing properties file
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                 Key: IVY-1074
                 URL: https://issues.apache.org/jira/browse/IVY-1074
             Project: Ivy
          Issue Type: Improvement
          Components: Core
            Reporter: Jeff Glatz
            Priority: Critical


we use ivy in our company and have our repository under version control which 
is checked out alongside our projects. our setup is designed to work when run 
from builds on an integration server, on developer's machines, and from under 
IDE plugins for IDEA and eclipse.

because the repository checkout will vary based on environment, we expect that 
a property called 'libraries.root' is defined and points to the individual 
repository location. when run from ant, this value is provided as a build 
property. the issue arises when ivy is run from the plugins because 
'libraries.root' is never set.

to facilitate this, we use a single ivysettings.xml file which does the 
following:

{code:xml|title=ivysettings.xml}
<ivysettings>
   ...
   <properties file="${ivy.settings.dir}/${user.name}.properties"/>
   ...
</ivysettings>
{code}

to load a properties file for the user where 'libraries.root' is defined.

the problem is that there are cases, such as when run under the integration 
server, where the user will not have a properties file. in this case, the 
configuration blows up. i propose adding a 'required' attribute to control the 
reaction to a missing file:

{code:xml|title=ivysettings.xml}
<ivysettings>
   ...
   <properties file="${ivy.settings.dir}/${user.name}.properties" 
required="false"/>
   ...
</ivysettings>
{code}

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