Searching before the module list is fully loaded breaks the tab

[sveneberth]

• Open an list module
• Click directly in the search bar, enter a term and hit Enter (don't wait until the list request is finished)
• The search abort the list fetch and the tab is empty
• The table header is missing and the search result is not shown (but one search request is performed)
• Further search requests aren't performed, the tab is dead

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Btw: This problem is not new, it exist already a long time.