CPackIFWInstaller: Avoid potential null pointer dereference
In d1683032 (CPackIFW: Improve warning and docs for show page list option, 2021-02-14), code was added to report the current QtIFW version. That code didn't check that there was a Generator object before using it, resulting in a scanbuild warning about a potential null pointer dereference. Add a check and output a more general warning message if we don't have the current QtIFW version available to report.
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