msiemens / tinydb / 227

98%

Pull #54

travis-ci

If there is no modified data, do not write.

This avoids an exception:

    Exception ValueError: 'I/O operation on closed file' in <bound method CachingMiddleware.__del__ of  <tinydb.middlewares.CachingMiddleware object at 0x7f9c96610a90>> ignored

The case happens when the objects has been closed and __del__ is invoked. Since the semantics guarantees
no writes after close, avoid storage.write when there are no changes in flush seems to be a reasonable fix.

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