Bug 1580285 - Log exception when we fail to change the master password. r=MattN

Differential Revision: https://phabricator.services.mozilla.com/D45422

--HG--
extra : moz-landing-system : lando

toolkit/mozapps/preferences/changemp.js

@@ -122,6 +122,7 @@ function setPassword() {
         createAlert("pw-change-failed-title", "incorrect-pw");
       }
     } catch (e) {
+      Cu.reportError(e);
       createAlert("pw-change-failed-title", "failed-pw-change");
     }
   } else {