Invalid input
Steps to reproduce:
1.Open a page with VE which has multiple references
2.Go to Insert>Reference>Use an existing reference
3.Now input something in the search box which will have no search result
4.Now cross out the dialog box
5.Again go to Insert>Reference
Observed Result:
The "Use an existing reference" button is disabled and it does not become enabled for the rest of the session unless user cancels the edit and reopen the page again with VE
Test Environment: https://test2.wikipedia.org/
Browser: Chrome Version 26.0.1410.65
OS: MAC OS X 10. 8. 5
Page:https://test2.wikipedia.org/wiki/User:RYasmeen_(WMF)/sandbox?veaction=edit
See the screenshots attached
Version: unspecified
Severity: minor
Attached: