Fix situation where "out" may not get set

Author: Kevin D Smith

swat/formatter.py

@@ -225,6 +225,8 @@ def format(self, value, sasfmt=None, width=12):
 
     def _generic_format(self, value, sasfmt=None, width=12):
         ''' Generic formatter for when tkefmt isn't available '''
+        out = None
+
         if isinstance(value, float64_types):
             if np.isnan(value) or value is None:
                 out = a2u(str(value))