Don't try to use parsed_url if it is nil.

Fixing issue #121 . I wasn't
able to reproduce the issue so this fix is a bit of a hack rather than
fixing the route cause that resulted in parsed_url being nil.

cewl.rb

@@ -17,7 +17,7 @@
 # Licence:: CC-BY-SA 2.0 or GPL-3+
 #
 
-VERSION = "6.2 (Fixes)"
+VERSION = "6.2.1 (More Fixes)"
 
 puts "CeWL #{VERSION} Robin Wood ([email protected]) (https://digi.ninja/)\n"
 
@@ -169,8 +169,10 @@ def start! #:nodoc:
 
 				y = []
 				x.select do |a_url, parsed_url|
-                    if (parsed_url.scheme == "mailto" or parsed_url.scheme == "http" or parsed_url.scheme == "https") then
-                      y << [a_url, parsed_url] if allowable_url?(a_url, parsed_url)
+                    if (not parsed_url.nil?) then
+                      if (parsed_url.scheme == "mailto" or parsed_url.scheme == "http" or parsed_url.scheme == "https") then
+                        y << [a_url, parsed_url] if allowable_url?(a_url, parsed_url)
+                      end
                     end
 				end