FIXED: parent shortcut didn't work if folder was empty, fixes #89 (#92)

Author: warpdesign

src/components/FileTable.tsx

@@ -731,16 +731,8 @@ export class FileTableClass extends React.Component<IProps, IState> {
                 break;
 
             case KEYS.Backspace:
-                // TODO: this is used in Log as well, share the code !
-                const { nodes } = this.state;
-
-                if (!this.editingElement && nodes.length) {
-                    const node = nodes[0];
-                    const file = node.nodeData as File;
-
-                    if (!fileCache.isRoot(file.dir)) {
-                        this.cache.openParentDirectory();
-                    }
+                if (!this.editingElement && !this.cache.isRoot()) {
+                    this.cache.openParentDirectory();
                 }
                 break;
         }

src/components/Toolbar.tsx

@@ -411,7 +411,7 @@ export class ToolbarClass extends React.Component<IProps, PathInputState> {
         const intent = status === -1 ? 'danger' : 'none';
         const count = selected.length;
 
-        const isRoot = fileCache.isRoot(fileCache.path);
+        const isRoot = fileCache.isRoot();
 
         return (
             <ControlGroup className="toolbar">

src/state/fileState.ts

@@ -562,7 +562,7 @@ export class FileState {
         });
     }
 
-    isRoot(path: string): boolean {
-        return this.api ? this.api.isRoot(path) : false;
+    isRoot(path = this.path): boolean {
+        return this.api ? path && this.api.isRoot(path) : false;
     }
 }