Add support to clear empty grid label

[flang]

Close #103

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[javier-godoy]

clearEmptyGridLabel keeps the component attached to the DOM but removes the association with the helper (it's a "component leak"), and now, I'm confused about why 8ae45df02cba1b2a294eee6d85df6f9b11b6186c was needed. The intent was that setEmptyGridLabel(null) would remove the label.

[flang]

Removing the empty grid label from its parent shouldn't be helper's responsibility IMHO. Helper should only make use of it.

[javier-godoy]

Removing the empty grid label from its parent shouldn't be helper's responsibility IMHO. Helper should only make use of it.

Good point. Helper does not add the label, hence removing it is not Helper's responsibility. However, there is a behavior change because calling setEmptyGridLabe twice will keep both components visible, but only the last label will synchronize with the provider..

Shouldn't it be implemented as follows? What do you think?

-    emptyLabel = component;
-    removeRegistration();
+   clearEmptyGridLabel();
+   emptyLabel = component;

I think there is an implicit contract that, whenever I call set, the old thing that has been set is now unset (whatever that means).

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[flang]

Let's just hide any existing empty grid label whenever set is call