Ignore errors when closing an old caching backend.
Review Request #8625 — Created Jan. 16, 2017 and submitted
When enabling new cache backend configuration, it was possible to hit an error closing the old backend, breaking the entire loading process. This meant that some bad default configuration would prevent a new good configuration from being used. We now ignore any errors encountered from closing the old backend.
Tested with a bad configuration being swapped out. I was still able to
load in the new configuration and continue on.
Tool: PEP8 Style Checker Processed Files: djblets/cache/forwarding_backend.py Tool: Pyflakes Processed Files: djblets/cache/forwarding_backend.py