Fix nativeProcs being null.

dumpStackTraces originally checked this. This only happens when a silent
ANR is triggerred on a process name not in NATIVE_STACKS_OF_INTEREST.

Bug: 36414311
Bug: 36652737
Test: manual
Change-Id: I24402fb2ef2e08482f866dc1086ce83c1365d7ec
1 file changed