Warning when re-applying filters

[davidperezsantos]

Describe the bug This code re-applies your filters on searches, an iterable check is needed in cases we have more than one object for a filter

To Reproduce When applying any filter in EasyAdmin (not only EntityFilter or relations), the filter works correctly but the following warning is always displayed:

(OPTIONAL) Additional context So the filtering itself works, but the warning appears unnecessarily on every search.