John Mastro eeaa707eb6 Fix a small incompatibility in ibuffer ...

Translate nil values from column functions to the empty string, so that
subsequent calls to string-width don't signal an error (Bug#26317).
* lisp/ibuffer.el (ibuffer-compile-format): If a column function returns
nil, treat it like the empty string.

2017-03-30 20:19:50 -04:00

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