Fixing warning messages

--HG--
branch : 1.x

src/Orchard.Tests/ContentManagement/DefaultContentManagerTests.cs

@@ -147,7 +147,7 @@ namespace Orchard.Tests.ContentManagement {
 
                         _transaction.Dispose();
                     }
-                    catch (Exception e) {
+                    catch {
                     }
                     finally {
                         _transaction = null;

src/Orchard.Tests/DataMigration/DataMigrationTests.cs

@@ -230,8 +230,6 @@ namespace Orchard.Tests.DataMigration {
 
             public int UpdateFrom1() {
                 throw new Exception();
-
-                return 2;
             }
 
             public int UpdateFrom2() {

src/Orchard.Web/Modules/Orchard.MediaLibrary/Controllers/OEmbedController.cs

@@ -64,7 +64,7 @@ namespace Orchard.MediaLibrary.Controllers {
                     }
                 }
             }
-            catch (Exception e) {
+            catch {
                 return View(viewModel);
             }
 

src/Orchard/Data/Migration/DataMigrationManager.cs

@@ -129,7 +129,7 @@ namespace Orchard.Data.Migration {
 
                     _transactionManager.RequireNew();
                 }
-                catch (Exception e) {
+                catch {
                     _transactionManager.Cancel();
                 }