only asking for a base if the parser exists.  #23021
only asking for a base if the parser exists.  #23021

sjchakrav/mechanize,sparklemotion/mechanize,pwnall/mechanize,flavorjones/mechanize,jeremiahmarks/mechanize,gchan/mechanize,jedisct1/mechanize,uksa/mechanize,jeremiahmarks/mechanize,pwnall/mechanize,bugmelody/mechanize,gchan/mechanize,eligoenergy/mechanize,bugmelody/mechanize,sjchakrav/mechanize,sparklemotion/mechanize,eligoenergy/mechanize,uksa/mechanize