Per #2631, fix masked array error in the get_precision(...) function …

…I encountered when using the utility to inspect the diffs for this PR.

scripts/python/utility/print_pointnc2ascii.py

@@ -158,7 +158,9 @@ def get_nc_var_string_data(self, nc_group, var_name):
     def get_precision(self, data_list):
         precision = 0
         for v in data_list:
-            if abs((v*10)-int(v*10)) < 0.000001 or abs((v*10)-int(v*10)) > 0.999998:
+            if np.ma.is_masked(v) or np.isnan(v):
+                continue 
+            elif abs((v*10)-int(v*10)) < 0.000001 or abs((v*10)-int(v*10)) > 0.999998:
                 if precision < 1:
                     precision = 1
             elif abs((v*100)-int(v*100)) < 0.000001 or abs((v*100)-int(v*100)) > 0.999998: