Fix crash when throwable cause is already initialized #9
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Issue
When trying to append a TraceurException to a throwable which has already had it's cause initialised, an exception is thrown.
See #7
Resolution
In this case, theres not much we can do to resolve the issue because Throwable#initCause is not designed to be called twice. So the fix in this PR uses the same logic as the RxJava2Extensions project by catching any exception and continuing.
See https://github.com/akarnokd/RxJava2Extensions/blob/2ec72c9a317da02717d207f876ca5ba43768d802/src/main/java/hu/akarnokd/rxjava2/debug/RxJavaAssemblyException.java#L129