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Prince$s
There isn't.I actually don't think there should be a very good chance of the Arabs spawning at war with the Vikings.
But in my experience, the Viking leader (Ragnar) is very happy to declare war on Arabia should another European civ requests it.
I rolled some 600AD England starts with SVN 451. Arabia generally seem to be doing very well, reaching their historical extent (Tripoli - Kandahar) and building the Spiral Minaret just before England spawn. Maybe the new Camel Archer (Withdrawal Rate instead of +% vs. Mounted) really helps Arab early expansion?
The point is while the no resistance in conquered cities UP would be cool, it may not be necessary for Arabia with the new Camel Archer (and small target city sizes). Another UP (e.g. my suggestion of stronger Theocracy/Fanaticism + Religious Building construction speed) may be more helpful.