Chuck Atkins 7772bd31f5 FindMatlab: Guard against nonexistent installation ...

Logic added by commit v3.12.0-rc1~183^2 (FindMatlab: Matlab Runtime
Compiler support, 2017-04-29) assumes that `VersionInfo.xml` exists
in the installation.  Fix it to tolerate a missing or empty file.

This change was originally made by commit v3.13.0-rc1~173^2 (FindMatlab:
Guard against nonexistent installation, 2018-08-27).  Here we backport
it to the 3.12.x series.

Fixes: #18436

2018-10-10 09:53:58 -04:00

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