fix: avoid storage mat with empty change table #61
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This change fixes a bug where if there is no change table specified, an empty case_storage.mat file will be created and sent to the server (Issue #60). This was because we were wiping the storage entry in the grid object only if a change table existed but did not contain storage entries.
We are fixing this by always keeping the storage dict in the grid object, and inspecting the length of grid.storage['gen'] to see if there is any storage present or not to determine whether or not to create and send a storage.mat file.