Patch for Sean Evoy:
This is a fix for the bug 41275. The problem was pretty simple; the delta
passed to a project when one of the projects it depends on changes, is
empty. I tried to optimize the managed builder to run only when a change
was passed to it, but this is a valid case. Now, if there is a 0-length
delta passed to a project, it simply calls make without regenerating any
makefiles.
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