fix wmllint-crashing map_data= bug involving empty quotes

wmllint crashes if the value for the map_data key consists of unfilled quotation marks (""), just as it does if there are no quotation marks:

----
Traceback (most recent call last):
  File "data/tools/wmllint", line 1917, in translator
    outmap = [outmap[0]] + outmap + [outmap[-1]]
IndexError: list index out of range
----

This simple fix checks to make sure that there are no side-by-side quotation marks on the line.

I also tidied up a double-space two lines down.

data/tools/wmllint

@@ -1816,8 +1816,9 @@ def translator(filename, mapxforms, textxform):
         # refer to map files which will be checked separately.
         if map_only or (("map_data=" in line or "mask=" in line)
                         and line.count('"') in (1, 2)
+                        and line.count('""') == 0
                         and line.count("{") == 0
-                        and  line.count("}") == 0
+                        and line.count("}") == 0
                         and not within('time')):
             outmap = []
             add_border = True