title: Dealing with non required forms in mysqli
body: <p>I am attempting to insert variables from a form into a mySQL database using a mysqli prepared statement. The problem I have run into is that one of my variables is not required and so when i don't enter anything for it in the form I get an error. 
  How do I properly deal with this variable?
  would i need to use a different prepared statement or could I keep the one I have? </p>