[8.x] Fix Eloquent Model 'loadMorph' and 'loadMorphCount'

[lBodia]

Currently, calling loadMorph or loadMorphCount throws an exception (get_class() expects parameter 1 to be object, null given) if requested polymorphic relation is null.

[taylorotwell]

What do you mean if the requested polymorphic relation is null? Example of how to recreate?

[lBodia]

1. Create columns for polymorphic relation with $table->nullableMorphs('imageable') or just make imageable_id and imageable_type nullable
2. Define imageable() relation inside Model
3. Create an entry in DB leaving imageable_id and imageable_type empty
4. Call $entry->loadMorph('imageable')