AFAIK, ";" is a perfectly valid separator for parameters and can be used instead of "&" (eg. http://myserver/page?msg=Hello+World;empty=;number=0). So it seems your parameter parsing code has a problem as well -- the invalid URLs aren't.
Apart from that, I second your statement -- it is often better to be a bit more liberal about validating your input than to throw unnecessary fatal errors at the user.
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