When performing a node name rework, it is possible (partially?) overwrite a node with another one simply by renaming an existing node.

Steps to reproduce:

1. Create a node named foo
2. Create another node named bar
3. Go to the bar node configuration
4. Rename it to foo and press Save

Expected results:

• An error message.

Actual results:

• Node bar replaces foo without any notice
• Things start to behave wacky: build starts to fail without a reason (see attached edited log, Jenkins-BuildBreakageAfterNodeRename.txt