fix to BaseViewController onFieldEdited to handle cellstr

Author: rjackey

widgets/+wt/+abstract/BaseViewController.m

@@ -205,7 +205,7 @@ function onFieldEdited(obj,evt,fieldName,index)
             newValue = evt.Value;
 
             % Treat char as string
-            if ischar(newValue)
+            if ischar(newValue) || iscellstr(newValue) %#ok<ISCLSTR>
                 newValue = string(newValue);
             end