Make MavenExecutionResult.getTopologicallySortedProjects() return empty list
instead of null
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Key: MNG-4904
URL: http://jira.codehaus.org/browse/MNG-4904
Project: Maven 2 & 3
Issue Type: Improvement
Reporter: Basil James Whitehouse III
MavenExecutionResult.getTopologicallySortedProjects() returns null when there
are no projects forcing consumers to perform null checks. Consider returning
an empty collection instead.
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