Make gcode parser more resilient to malformed lines

printrun/gcoder.py

@@ -63,6 +63,11 @@ def P(line):
 
 def split(line):
     split_raw = gcode_exp.findall(line.raw.lower())
+    if not split_raw:
+        line.command = line.raw
+        line.is_move = False
+        print "Warning: raw line \"%s\" could not be parsed" % line.raw
+        return line.raw
     command = split_raw[0] if split_raw[0][0] != "n" else split_raw[1]
     line.command = command[0].upper() + command[1]
     line.is_move = line.command in move_gcodes