CPack: Fix crash on invalid generator name
In !1583 (merged) a nullptr dereference was added that occurs when cpack -G NotAGenerator is invoked. Add the needed condition.
Fixes: #17900 (closed)
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In !1583 (merged) a nullptr dereference was added that occurs when cpack -G NotAGenerator is invoked. Add the needed condition.
Fixes: #17900 (closed)