cleaned up imports, mobx observable initialization and some compile errors.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/client/views/collections/TreeView.tsx b/src/client/views/collections/TreeView.tsx
index a7705ea7e..72882ac17 100644
--- a/src/client/views/collections/TreeView.tsx
+++ b/src/client/views/collections/TreeView.tsx
@@ -93,7 +93,7 @@ export class TreeView extends ObservableReactComponent<TreeViewProps> {
     static _openLevelScript: Opt<ScriptField | undefined>;
     private _header: React.RefObject<HTMLDivElement> = React.createRef();
     private _tref = React.createRef<HTMLDivElement>();
-    @observable _docRef: Opt<DocumentView>;
+    @observable _docRef: Opt<DocumentView> = undefined;
     private _disposers: { [name: string]: IReactionDisposer } = {};
     private _editTitleScript: (() => ScriptField) | undefined;
     private _openScript: (() => ScriptField) | undefined;