Fix potential crash when store writer fails to init . Code from : https://github.com/couchbase/couchbase-lite-ios/blob/66133e2ec76851ed16828f3b05476de0671ced3e/Source/CBLMultipartDocumentReader.m#L263-L267
Fix potential crash when store writer fails to init . Code from :
https://github.com/couchbase/couchbase-lite-ios/blob/66133e2ec76851ed16828f3b05476de0671ced3e/Source/CBLMultipartDocumentReader.m#L263-L267

evsukov89/couchbase-lite-ios,evsukov89/couchbase-lite-ios,evsukov89/couchbase-lite-ios