Fix query parsing issues #1
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When passed ' ' as a query string, the server crashes cause of illegal memory access done in httplib::detail::split. Have added checks to make sure the split function has a valid string with length > 0.
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httplib::detail::split wasn't doing proper boundary checks. Inputs like "/? " (query with only spaces) or "/?= =" were crashing the server cause of illegal memory access done by the process, creating a potential security vulnerability, as this could be leveraged to make a DoS attack