AIOOB when displaying a dataset with one dimension

Illustrated in this sample python script:

```
# @OpService ops
# @DisplayService display

blank = ops.createimg(100)

display.createDisplay(blank)
```

Which causes the following exception:

```
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
at net.imagej.display.DefaultDatasetView.xyPlane(DefaultDatasetView.java:340)
at net.imagej.display.DefaultDatasetView.autoscale(DefaultDatasetView.java:169)
at net.imagej.display.DefaultDatasetView.initializeView(DefaultDatasetView.java:515)
at net.imagej.display.DefaultDatasetView.rebuild(DefaultDatasetView.java:399)
at net.imagej.display.DefaultImageDisplay.rebuild(DefaultImageDisplay.java:136)
at net.imagej.display.DefaultImageDisplay.display(DefaultImageDisplay.java:274)
at org.scijava.display.DefaultDisplayService.createDisplay(DefaultDisplayService.java:221)
at org.scijava.display.DefaultDisplayService.createDisplay(DefaultDisplayService.java:207)
```

Which makes sense, since there is no "Y" for a y plane.

Start with the sample script and the stack trace in net.imagej.display.DefaultDatasetView, especially xyPlane, autoscale, initializeView, and rebuild. Trace how a one-dimensional dataset is handled during display initialization. Done means displaying the sample dataset without an ArrayIndexOutOfBoundsException.

Written by the indexing model from the issue text.