Copy original URI button is broken / throws JS error

[jvendetti]

Steps to reproduce:

• Navigate to the Classes tab for any ontology in BioPortal
• Select any class in the class tree
• In the Details pane, click the "Copy original URI" button next to the class ID

The ID isn't copied to the clipboard, and the developer console shows a JS error:

application-96b038b81bc337faeb68edb55ab4ebc7cc15c08ce8aec65a58dbe2a4bde57cfb.js:32 Error invoking action "click->clipboard#copy"

Error: Missing target element "source" for "clipboard" controller
    at e.get (application-96b038b81bc337faeb68edb55ab4ebc7cc15c08ce8aec65a58dbe2a4bde57cfb.js:4:15243)
    at e.copy (application-96b038b81bc337faeb68edb55ab4ebc7cc15c08ce8aec65a58dbe2a4bde57cfb.js:32:14060)
    at wd.invokeWithEvent (application-96b038b81bc337faeb68edb55ab4ebc7cc15c08ce8aec65a58dbe2a4bde57cfb.js:31:5963)
    at wd.handleEvent (application-96b038b81bc337faeb68edb55ab4ebc7cc15c08ce8aec65a58dbe2a4bde57cfb.js:31:5352)
    at fd.handleEvent (application-96b038b81bc337faeb68edb55ab4ebc7cc15c08ce8aec65a58dbe2a4bde57cfb.js:31:1429)