[DataGridPro] Don't throw error in column pinning #9507
Merged
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Closes #9440
Prevent an error from being thrown if a callback is called after the row container is unmounted.
Before: https://codesandbox.io/s/muidgridpro-pinnedcolumn-lazyloadroute-error-forked-73t2c6
After: https://codesandbox.io/s/muidgridpro-pinnedcolumn-lazyloadroute-error-forked-ng3cv4