"Undefined index: #parameters" and other error in custom module
You could write a small custom module that -


Form alters views exposed filter form of the particular view in question
Add a new validate function to the form above (validate function is called before the actual form submit function is called and allows you to manipulate values)
Then in the validate function you could edit the particular exposed filter form field replacing commas with nothing.


Here is a sample code that I found on Googling around - http://drupal.org/node/716420#comment-2634540

Hope this helps.