Fix some bugs in Bibles and PresentationManager

openlp/plugins/bibles/lib/mediaitem.py

@@ -608,6 +608,9 @@ class BibleMediaItem(MediaManagerItem):
         :return: None
         """
         book_ref_id = self.select_book_combo_box.currentData()
+        if not book_ref_id:
+            # If there is no book selected, just exit early
+            return
         book = self.plugin.manager.get_book_by_id(self.bible.name, book_ref_id)
         self.chapter_count = self.plugin.manager.get_chapter_count(self.bible.name, book)
         verse_count = self.plugin.manager.get_verse_count_by_book_ref_id(self.bible.name, book_ref_id, 1)

openlp/plugins/songs/lib/importers/presentationmanager.py

@@ -80,6 +80,7 @@ class PresentationManagerImport(SongImport):
             except etree.XMLSyntaxError:
                 # Try to detect encoding and use it
                 self.process_xml(file_path, get_file_encoding(file_path))
+                return
 
         file_str = etree.tostring(tree)
         if not file_str:

tests/openlp_plugins/bibles/test_mediaitem.py

@@ -933,6 +933,20 @@ def test_on_advanced_book_combo_box(media_item):
         assert mocked_critical_error_message_box.called is True
 
 
+def test_on_advanced_book_combo_box_no_selection(media_item):
+    """
+    Test on_advanced_book_combo_box when there is nothing selected
+    """
+    # GIVEN: An instance of :class:`MediaManagerItem` and a mocked manager
+    media_item.select_book_combo_box = MagicMock(**{'currentData.return_value': None})
+
+    # WHEN: Calling on_advanced_book_combo_box
+    media_item.on_advanced_book_combo_box()
+
+    # THEN: The method should exit early, and no query made
+    assert media_item.plugin.manager.get_book_by_id.call_count == 0
+
+
 def test_on_advanced_book_combo_box_set_up_comboboxes(media_item):
     """
     Test on_advanced_book_combo_box when the book returns 6 for the verse count.