According to comments by @k-s & @raster.
See 784a5b56a3 this was intended to be a fallback, not the first
lookup indeed. Since this is an error case, let's print an ERR message
at least.
If the object has no parent or anything else goes a bit wrong,
efl_loop_get() may fail to return the loop object. It's a bit ridiculous
when we're in the main loop as we know which loop object was requested.
This avoids returning NULL.