catch exceptions in Android Database helper (#7027) (#7040)

(cherry picked from commit 7ed2e73a91)

Co-authored-by: Elias Nahum <nahumhbl@gmail.com>

android/app/src/main/java/com/mattermost/helpers/DatabaseHelper.kt

@@ -20,6 +20,7 @@ class DatabaseHelper {
 
     val onlyServerUrl: String?
         get() {
+            try {
                 val query = "SELECT url FROM Servers WHERE last_active_at != 0 AND identifier != ''"
                 val cursor = defaultDatabase!!.rawQuery(query)
                 if (cursor.count == 1) {
@@ -28,6 +29,10 @@ class DatabaseHelper {
                     cursor.close()
                     return url
                 }
+            } catch (e: Exception) {
+                e.printStackTrace()
+                // let it fall to return null
+            }
             return null
         }
 
@@ -38,6 +43,7 @@ class DatabaseHelper {
     }
 
     fun getServerUrlForIdentifier(identifier: String): String? {
+        try {
             val args: Array<Any?> = arrayOf(identifier)
             val query = "SELECT url FROM Servers WHERE identifier=?"
             val cursor = defaultDatabase!!.rawQuery(query, args)
@@ -47,6 +53,10 @@ class DatabaseHelper {
                 cursor.close()
                 return url
             }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            // let it fall to return null
+        }
         return null
     }
 
@@ -63,11 +73,13 @@ class DatabaseHelper {
                 return resultMap
             }
         } catch (e: Exception) {
+            e.printStackTrace()
             return null
         }
     }
 
     fun getDatabaseForServer(context: Context?, serverUrl: String): Database? {
+        try {
             val args: Array<Any?> = arrayOf(serverUrl)
             val query = "SELECT db_path FROM Servers WHERE url=?"
             val cursor = defaultDatabase!!.rawQuery(query, args)
@@ -77,6 +89,10 @@ class DatabaseHelper {
                 cursor.close()
                 return Database(databasePath, context!!)
             }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            // let it fall to return null
+        }
         return null
     }
 
@@ -148,6 +164,7 @@ class DatabaseHelper {
     }
 
     fun queryPostSinceForChannel(db: Database?, channelId: String): Double? {
+        try {
             if (db != null) {
                 val postsInChannelQuery = "SELECT last_fetched_at FROM MyChannel WHERE id=? LIMIT 1"
                 val cursor1 = db.rawQuery(postsInChannelQuery, arrayOf(channelId))
@@ -161,6 +178,10 @@ class DatabaseHelper {
                     return lastFetchedAt
                 }
             }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            // let it fall to return null
+        }
         return null
     }