[8.x] Fix morphTo attempting to map an empty string morph type to an instance #35824
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GrahamCampbell
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After upgrading to 8 our morphTo relations started throwing exceptions.
#35364 allowed mapping literal 0 in morphType, this was backported to 6.x and 7.x with an additional check to not attempt to map an empty string to a type (#35487). This PR adds the empty string check into 8.x.