Uncaught TypeError: outputs[index].data.concat is not a function

Was trying to test it out and ran into the following issue (posted below). I'm running OS X 10.9.5. Python 2 and 3 installed via homebrew. All packages installed via pip.
1. First cell, ran `import pandas as pd`. No problem.
2. Next cell, just to test it, ran `pd.DataFrame()`. Got the error below
3. If I instead assign it to a variable and then ask it to return the variable (i.e. run `a = pd.DataFrame()` and in the next cell run `a`) it works fine.

Output below automatically generated from the error reporting

---

**Atom Version**: 1.5.3
**System**: Mac OS X 10.9.5
**Thrown From**: [jupyter-notebook](https://github.com/jupyter/atom-notebook) package, v0.0.9
### Stack Trace

Uncaught TypeError: outputs[index].data.concat is not a function

```
At /Users/$USER/.atom/packages/jupyter-notebook/lib/notebook-editor.js:125

TypeError: outputs[index].data.concat is not a function
at Object.NotebookEditor.onAction [as ID_1] (/Users/$USER/.atom/packages/jupyter-notebook/lib/notebook-editor.js:125:59)
at Dispatcher._invokeCallback (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/flux/lib/Dispatcher.js:198:24)
at Dispatcher.dispatch (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/flux/lib/Dispatcher.js:174:14)
at future.onIOPub (/Users/$USER/.atom/packages/jupyter-notebook/lib/notebook-editor.js:192:20)
at KernelFutureHandler._handleIOPub (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/jupyter-js-services/lib/kernel.js:1273:13)
at KernelFutureHandler.handleMsg (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/jupyter-js-services/lib/kernel.js:1252:22)
at Kernel._onWSMessage (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/jupyter-js-services/lib/kernel.js:786:24)
at WebSocket._ws.onmessage (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/jupyter-js-services/lib/kernel.js:752:53)
at WebSocket.onMessage (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/WebSocket.js:418:14)
at emitTwo (events.js:87:13)
at WebSocket.emit (events.js:172:7)
at Receiver.ontext (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/WebSocket.js:816:10)
at /Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/Receiver.js:477:18
at Receiver.applyExtensions (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/Receiver.js:364:5)
at /Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/Receiver.js:466:14
at Receiver.flush (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/Receiver.js:340:3)
at Receiver.opcodes.1.finish (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/Receiver.js:482:12)
at Receiver.expectHandler (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/Receiver.js:457:31)
at Receiver.add (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/Receiver.js:95:24)
at Socket.realHandler (/Users/$USER/.atom/packages/jupyter-notebook/node_modules/ws/lib/WebSocket.js:800:20)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at readableAddChunk (_stream_readable.js:146:16)
at Socket.Readable.push (_stream_readable.js:110:10)
at TCP.onread (net.js:523:20)
```
### Commands

```
-2:31.8.0 core:backspace (atom-text-editor.editor.is-focused)
-2:31.3.0 editor:consolidate-selections (atom-text-editor.editor.is-focused)
-2:31.3.0 core:cancel (atom-text-editor.editor.is-focused)
-2:04.5.0 core:copy (div.cell-display-area.native-key-bindings)
-0:36.1.0 jupyter-notebook-atom:run (atom-text-editor.editor.is-focused)
7x -0:32.1.0 core:backspace (atom-text-editor.editor.is-focused)
-0:28.1.0 jupyter-notebook-atom:run (atom-text-editor.editor.is-focused)
-0:25.6.0 core:backspace (atom-text-editor.editor.is-focused)
2x -0:25.2.0 jupyter-notebook-atom:run (atom-text-editor.editor.is-focused)
-0:12 snippets:next-tab-stop (atom-text-editor.editor.is-focused)
-0:12 snippets:expand (atom-text-editor.editor.is-focused)
5x -0:11.2.0 core:backspace (atom-text-editor.editor.is-focused)
-0:09.3.0 snippets:next-tab-stop (atom-text-editor.editor.is-focused)
-0:09.3.0 snippets:expand (atom-text-editor.editor.is-focused)
-0:09.3.0 editor:indent (atom-text-editor.editor.is-focused)
5x -0:08.5.0 core:backspace (atom-text-editor.editor.is-focused)
```
### Config

``` json
{
"core": {},
"jupyter-notebook": {
"jupyterPath": "/usr/local/bin/jupyter"
}
}
```
### Installed Packages

``` coffee
# User
jupyter-notebook, v0.0.9

# Dev
No dev packages
```