Problem
If external application link's authorization settings are inconsistent, JIRA silently skips loading plugins from remote system (Bamboo, e.g)

Steps to reproduce

1. Create reciprocal app link to Bamboo (Bamboo server should be executed) on Administration/Application links Jira page.
2. Ensure that incoming/outgoing auth. settings are inconsistent (disable both OAuth and Trusted auth on Jira side, e.g.).
3. Go to dashboard screen and try to find Bamboo gadgets

Result
No gadgets are found, no error/warning messages are displayed.
Jira logs contain many records similar to the following:

2016-03-25 21:47:34,030 DirectoryEntryResolverThread-13 WARN jirauser 1290x149x1 1tk8wcq 127.0.0.1 /rest/config/1.0/directoryitems/local.json [c.a.g.r.internal.http.HttpClientFetcher] A request t
o http://black-virtualbox:8085/bamboo/rest/gadgets/1.0/g/com.atlassian.bamboo.gadgets/status/planStatus.xml has been denied.  To allow requests to this URL add the application URL to your whiteli
st (http://confluence.atlassian.com/x/KQfCDQ ).

Expected Result
Error or warning sign with comprehensive explanation is displayed in the user interface.