[TYPO3-core] Bugfix to Bidi-MM: Set tablenames field only when necessary

[Ingmar Schlecht]

Hi guys,

the bidirectional MM relation feature by Sebastian and me had a little
quirk:
It tried to set the "tablenames" field in writeMM() always, even if it
was a simple two-table relationship, which caused the insert queries to
not work in such cases, because the MM table didn't have the tablenames
field.

The attached patch fixes that problem by setting the tablenames field
only when necessary.

Branches: trunk only.

cheers
Ingmar
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