[widgets][libraryeditor] Add missing documentation

Test cleanup

beat/editor/test/test_libraryeditor.py

@@ -33,6 +33,7 @@ class TestLibraryEditor:
     def test_load_and_dump(self, qtbot, test_prefix):
         reference_json = {"description": "test", "uses": {}}
         editor = LibraryEditor()
+        qtbot.addWidget(editor)
         editor.set_prefix_root(test_prefix)
         editor.load_json(reference_json)
 
@@ -42,6 +43,7 @@ class TestLibraryEditor:
         faulty_json = {"description": "test", "uses": {"alias": "test/dummy/1"}}
         reference_json = {"description": "test", "uses": {}}
         editor = LibraryEditor()
+        qtbot.addWidget(editor)
         editor.set_prefix_root(test_prefix)
         editor.load_json(faulty_json)
 

beat/editor/widgets/libraryeditor.py

@@ -34,7 +34,14 @@ from .libraries import LibrariesWidget
 
 @frozen
 class LibraryEditor(AbstractAssetEditor):
+    """Editor for the Library asset"""
+
     def __init__(self, parent=None):
+        """Constructor
+
+        :param parent QWidget: parent of this widget
+        """
+
         super(LibraryEditor, self).__init__(parent)
         self.setObjectName(self.__class__.__name__)
         self.set_title(self.tr("Library"))