some error handling

app/src/main/java/org/wntr/mdeditor/MainActivity.kt

@@ -813,8 +813,7 @@ class MainActivity : AppCompatActivity() {
             putExtra(DocumentsContract.EXTRA_INITIAL_URI, thisFileUri)
 
             type = "text/*"
-            getDisplayName(thisFileUri).apply { putExtra(Intent.EXTRA_TITLE, getDisplayName(
-                thisFileUri)) }
+
             addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION)
             addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
             addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
@@ -1067,6 +1066,7 @@ class MainActivity : AppCompatActivity() {
                 ).show()
             })
         }
+
         CoroutineScope(Dispatchers.Main).launch {
             withContext(Dispatchers.IO) {
                 try {
@@ -1088,7 +1088,6 @@ class MainActivity : AppCompatActivity() {
                 catch (e: java.io.FileNotFoundException) {
                     Log.d(javaClass.simpleName, "File not found during reading:\n${e.stackTraceToString()}")
                     this@MainActivity.runOnUiThread({
-                        selectFileForSaveAs()
                         Toast.makeText(
                             this@MainActivity,
                             "File not found during reading.\n$e",
@@ -1097,6 +1096,17 @@ class MainActivity : AppCompatActivity() {
                     })
                     return@withContext
                 }
+                catch (e: java.lang.NullPointerException) {
+                    Log.d(javaClass.simpleName, "Nullpointerexception. Maybe file deleted in the meantime?.\n$e")
+                    this@MainActivity.runOnUiThread({
+                        Toast.makeText(
+                            this@MainActivity,
+                            "Nullpointerexception. Maybe file deleted in the meantime?.\n$e",
+                            Toast.LENGTH_LONG
+                        ).show()
+                    })
+                    return@withContext
+                }
                 catch (e: Exception) {
                     Log.d(javaClass.simpleName, e.stackTraceToString())
                     this@MainActivity.runOnUiThread({