fix ClasspathComputer: ignore if oldEntry not found #820 #1601
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fixes random failing ClasspathUpdaterTest
When IJavaProject.setRawClasspath() is explicitly called with ClasspathEntries distinct from PDE (like in the Test), and then later PDEs UpdateClasspathJob is executed it can't compute the "oldEntry" and fails with "... is not on its projects build path". The Message is correct - it was manually removed from the projects build path. That state should just be ignored so that PDE continues to set the IClasspathEntries computed by PDE.
#820