prevent NPE, check return value before use

[homberghp]

Check returned array value before using, avoiding NPE.

While working on an unrelated subject, I got an error notification that mentions an NPE in the modified file

Simply add a check of the return value before dereferencing it in the following for-each statement. The result is that no elements will be added to the list in the for-each loop, which looks okay to me in that case.

https://github.com/apache/netbeans/blob/68e420dcd08d0e1a3bb7fc1687dd0722881e9422/ide/web.webkit.debugging/src/org/netbeans/modules/web/webkit/debugging/api/Runtime.java#L75-L80

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