remove spurious string substitution from a "pango string" message

The format of this message appears to have been copied from the preceding "pango string" messages, which have a "%s" where "< or >" is. But it causes wmllint to crash with the traceback, "TypeError: not all arguments converted during string formatting".
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.