Tree calculation out of memory error not passed to user!

If jalview 2.11.4.1 runs out of memory whilst building the similarity matrix during the tree calculation, it leaves the window showing and doesn't let the user know.

WARN - Request to http://127.0.0.1:9124 returned java.net.ConnectException: Connection refused (Connection refused)
Exception in thread "Thread-36" java.lang.OutOfMemoryError: Java heap space
at jalview.math.Matrix.<init>(Matrix.java:104)
at jalview.analysis.scoremodels.ScoreMatrix.findSimilarities(ScoreMatrix.java:498)
at jalview.analysis.scoremodels.ScoreMatrix.findSimilarities(ScoreMatrix.java:471)
at jalview.analysis.scoremodels.SimilarityScoreModel.findDistances(SimilarityScoreModel.java:40)
at jalview.analysis.TreeBuilder.computeTree(TreeBuilder.java:124)
at jalview.analysis.TreeBuilder.<init>(TreeBuilder.java:78)
at jalview.analysis.AverageDistanceTree.<init>(AverageDistanceTree.java:44)
at jalview.gui.TreePanel$TreeLoader.run(TreePanel.java:392)

Simply needs wrapping with an OOMError try/catch and appropriate warning dialog shown as in other places.