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(parent: e04810e) | patch

Fix core dump due to null-pointer dereference in to_char() when datetime

Fix core dump due to null-pointer dereference in to_char() when datetime
format codes are misapplied to a numeric argument. (The code still produces
a pretty bogus error message in such cases, but I'll settle for stopping the
crash for now.) Per bug #4700 from Sergey Burladyan.

Problem exists in all supported branches, so patch all the way back.
In HEAD, also clean up some ugly coding in the nearby cache management
code.

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