maintransformer: when the namespace is empty use error() instead of fatal()
network-manager is calling things like this during configure: g-ir-scanner --namespace=test --library=c /dev/null --output /dev/null to test if the scanner is working. This results in a fatal error, but beause of #229 was ignored. Do keep this working after we fix #229 downgrade this to a simple recoverable error message. An empty namespace doesn't prevent the scanner from creating a .gir file so this should be fine.
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