openconfig / goyang / 6700264982

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Fix panic if module by prefix is not found in Find() (#252)

Previously, if FindModuleByPrefix() returns nil in Find(), it would
continue to call module() with nil, resulting in a nil pointer
dereference panic when trying to call ParentNode() from RootNode().
The fix is to return an error if FindModuleByPrefix() returns nil.

Fixes #251

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