Eliminated structurally dead code.

CID 1369621, 1369622, 1369623.

src/models/accountmodel.cpp

@@ -373,7 +373,7 @@ QVariant AccountListModel::data(const QModelIndex &index, int role) const
 		return acntData._sentTotal;
 		break;
 	default:
-		return QVariant();
+		/* Do nothing. */
 		break;
 	}
 

src/models/filemodel.cpp

@@ -128,7 +128,7 @@ QVariant FileListModel::data(const QModelIndex &index, int role) const
 		return file.icon();
 		break;
 	default:
-		return QVariant();
+		/* Do nothing. */
 		break;
 	}
 

src/models/messagemodel.cpp

@@ -178,7 +178,7 @@ QVariant MessageListModel::data(const QModelIndex &index, int role) const
 		return message.attachmentsDownloaded();
 		break;
 	default:
-		return QVariant();
+		/* Do nothing. */
 		break;
 	}