add some null checks at getting current text

Author: tibbi

app/src/main/kotlin/com/simplemobiletools/notes/activities/MainActivity.kt

@@ -214,7 +214,8 @@ class MainActivity : SimpleActivity(), ViewPager.OnPageChangeListener {
 
     private fun exportAsFile() {
         ExportAsDialog(this, mCurrentNote) {
-            exportNoteValueToFile(it, getCurrentNoteText())
+            if (getCurrentNoteText()?.isNotEmpty() == true)
+                exportNoteValueToFile(it, getCurrentNoteText()!!)
         }
     }
 
@@ -307,7 +308,7 @@ class MainActivity : SimpleActivity(), ViewPager.OnPageChangeListener {
 
     private fun shareText() {
         val text = getCurrentNoteText()
-        if (text.isEmpty()) {
+        if (text == null || text.isEmpty()) {
             toast(R.string.cannot_share_empty_text)
             return
         }

app/src/main/kotlin/com/simplemobiletools/notes/adapters/NotesPagerAdapter.kt

@@ -34,7 +34,7 @@ class NotesPagerAdapter(fm: FragmentManager, val notes: List<Note>, val activity
 
     override fun getPageTitle(position: Int) = notes[position].title
 
-    fun getCurrentNoteViewText(position: Int) = fragments[position].getCurrentNoteViewText()
+    fun getCurrentNoteViewText(position: Int) = fragments[position]?.getCurrentNoteViewText()
 
     fun saveCurrentNote(position: Int) = fragments[position]?.saveText()