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Error case for NULL arg causing segfault in iocshArgPersistentString

Heinz Junkes requested to merge github/fork/aaron-long/add_NULL_arg_check_for_persistent_string into 7.0

Created by: aaron-long

As per bug report, iocshPersistentString will check if the given arg is NULL before any C lib functions are used against it which can cause segfaults.

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