DBManager: fix int/float conversion to unicode (partially revert changes in 401f43c and fix #13505)

Author: brushtyler

python/plugins/db_manager/db_plugins/data_model.py

@@ -76,7 +76,10 @@ def data(self, index, role):
         elif isinstance(val, (str, unicode)) and len(val) > 300:
             # too much data to display, elide the string
             val = val[:300]
-        return unicode(val, 'utf-8', 'replace') # convert from utf8 and replace errors (if any)
+        try:
+            return unicode(val) # convert to unicode
+        except UnicodeDecodeError:
+            return unicode(val, 'utf-8', 'replace') # convert from utf8 and replace errors (if any)
 
     def headerData(self, section, orientation, role):
         if role != Qt.DisplayRole: