Fail gracefully when inner class const_missing finds nothing #5835
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This should fix the issue reported as a comment in ruboto/JRuby9K_POC#7.
The issue here appears to be that non-existent inner classes are not handled properly; the resulting null or nil values fail to cast to expected types and the superclass const_missing fallback never triggers.
The change I have here uses a different path for acquiring a reference to the proxy class, which then allows the fallback to fire properly.
The original change was made by @kares in #3333 but it appears the test cases added did not test the case where there is no inner class for the constant.