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[WEEX-524][iOS] Try to fix a crash operating mutable array in multi-thread #1357
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Try to fix a crash:
Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndexedSubscript:]: index 0 beyond bounds for empty array'
Last Exception Backtrace:
0 CoreFoundation __exceptionPreprocess :228 (in CoreFoundation)
1 _objc_exception_throw :56
2 CoreFoundation _CFThrowFormattedException :112 (in CoreFoundation)
3 -[__NSArrayM objectAtIndexedSubscript:] :192 (in CoreFoundation)
4 -[WXThreadSafeMutableArray objectAtIndex:] WXThreadSafeMutableArray.m:0
5 -[WXBridgeContext topInstance] WXBridgeContext.m:0
6 +[WXSDKEngine topInstance] WXSDKEngine.m:277