Make backingStore optional rather than force unwrapped #445
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Issue Description
While testing one perhaps doesn't want to initialize Parse or all other dependencies. however Installation.current is optional but it's backingStore is force unwrapped causing a crash when trying to get .current installation if Parse hasn't been initialized rather than just returning nil.
Closes: issue
Approach
removed ! added ? made it compile 馃し
TODOs before merging