JsonParser: Ignore errors converting to property type.

VAR.Json/JsonParser.cs

@@ -91,9 +91,16 @@ namespace VAR.Json
                         valueDest = new Guid((string)valueOrig);
                     }
                     else
+                    {
+                        try
                         {
                             valueDest = Convert.ChangeType(obj[prop.Name], effectiveType);
                         }
+                        catch (Exception)
+                        {
+                            continue;
+                        }
+                    }
                     prop.SetValue(newObj, valueDest, null);
                 }
             }