fixing obscure expression list expression editor bug when you don't focus the SSIS designer window first

Author: furmangg

SSIS/ExpressionListControl.cs

@@ -90,7 +90,7 @@ private void expressionGrid_CellContentClick(object sender, DataGridViewCellEven
             }
             catch (Exception ex)
             {
-                MessageBox.Show("Error occured while editing the expression: " + ex.Message);
+                MessageBox.Show("Error occured while editing the expression: " + ex.Message + "\r\n" + ex.StackTrace);
             }
         }
 

SSIS/ExpressionListPlugin.cs

@@ -255,6 +255,12 @@ private void SetPackageAsDirty(IDTSSequence container, string expression, object
                 PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(objectChanged);
                 System.ComponentModel.PropertyDescriptor expressionsProperty = properties.Find("Expressions", false);
 
+                if (designer == null)
+                {
+                    System.Diagnostics.Debug.WriteLine("designer was null in SetPackageAsDirty");
+                    return;
+                }
+
                 // Mark package object as dirty
                 IComponentChangeService changeService = (IComponentChangeService)designer.GetService(typeof(IComponentChangeService));
                 if (objectChanged == null)