View Labels - crash when trimming all nodes in a displayed tree

[GoogleCodeExporter]

What steps will reproduce the problem?
1.  Trim a tree to match the basedata, but where no branches match so all will 
be deleted

What is the expected output? What do you see instead?
It should display nothing, instead it crashes.  

This is possibly caused by the labels_group not being updated, but a 
work-around is to not centre the tree when the sum of branch lengths is zero.  

Original issue reported on code.google.com by shawnlaffan on 3 Dec 2014 at 4:26

[GoogleCodeExporter]

Original comment by shawnlaffan on 3 Dec 2014 at 4:26

• Changed title: View Labels - crash when trimming all nodes in a displayed tree
• Added labels: ****
• Removed labels: ****

[GoogleCodeExporter]

This issue was updated by revision r3096.

Avoid recentring the tree when there is not length to display.  
A better fix might be to clear the lines_group.

Original comment by shawnlaffan on 3 Dec 2014 at 4:27

• Added labels: ****
• Removed labels: ****

[GoogleCodeExporter]

Mark as fixed

Original comment by shawnlaffan on 3 Dec 2014 at 5:36

• Changed state: Fixed
• Added labels: ****
• Removed labels: ****