Fixed the behavior of backspace key when using search_key=None #95
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When search_key=None, if we press backspace as the first character, the word is entered literally ("backspace") as the search term.
If the search_key is None and backspace is pressed, do nothing. (Do not set the search_key to "backspace".)
Partially resolves #41 (The issue with accented characters mentioned in the issue description is not handled.)