Fix app crash on upgrade.

Author: Jana Hoch

app/src/main/java/com/blogspot/e_kanivets/moneytracker/repo/DbHelper.java

@@ -169,6 +169,14 @@ public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
             /* Add notes column to the records table */
             db.execSQL("ALTER TABLE " + TABLE_RECORDS + " ADD COLUMN "
                     + NOTES_COLUMN + " TEXT;");
+
+            /* Set the notes as empty string for all the record*/
+            ContentValues contentValues = new ContentValues();
+            contentValues.put(NOTES_COLUMN, "");
+            db.update(DbHelper.TABLE_RECORDS, contentValues, null, null);
+
+            db.setTransactionSuccessful();
+            db.endTransaction();
         }
     }