Manage Handles UI issues

[kuchtiak-ufal]

There are some issues related to handle management UI:

1. When admin opens the Manage Handles UI, the Search Option needs to be selected. The Search button is not working until some search option is selected, but user is not prevented to type anything into search text field

Solution: either disable text field or provide some full text search at the moment no Search Option is selected

2. Search by "Internal":

User is allowed to put any text into search text field, but only Yes/No values have sense. Moreover the Search button pretends to be working, but provides incorrect result

Solution: provide combo box with Yes, No values, Also may be change "Internal" option to "Is internal"

3. Search by "Resource type":

I tried to put "collection" text, and this does not work:

Seems that search Resource Type for: "collection", "community", "xyz" doesn't work Search Resource type for: "Collection", "Community", "Item", "item" works fine

Search by Resource type seems to be partially Case sensitive.

Solution: provide combo box with available values (Item|Collection|Community)

[kosarko]

@kuchtiak-ufal seems most of it was fixed, can you test?

[kuchtiak-ufal]

See my comments in: https://github.com/dataquest-dev/dspace-angular/issues/883