Query complains too much when network is disconnected

[awilkins]

The usual Mylyn behaviour with the network is offline is just for the yellow warning triangle to decorate the query folder.

The Redmine connector throws an uncaught exception, which leads to a modal dialog box "Execution of method failed" - this is unnecessarily disruptive and interrupts the user.

Stack trace below

net.sf.redmine_mylyn.api.exception.RedmineApiErrorException: Execution of method failed
    at net.sf.redmine_mylyn.internal.api.client.AbstractClient.performExecuteMethod(AbstractClient.java:191)
    at net.sf.redmine_mylyn.internal.api.client.AbstractClient.executeMethod(AbstractClient.java:83)
    at net.sf.redmine_mylyn.internal.api.client.AbstractClient.executeMethod(AbstractClient.java:74)
    at net.sf.redmine_mylyn.internal.api.client.Api_2_7_ClientImpl.query(Api_2_7_ClientImpl.java:250)
    at net.sf.redmine_mylyn.internal.core.client.Client.query(Client.java:111)
    at net.sf.redmine_mylyn.core.RedmineRepositoryConnector.performQuery(RedmineRepositoryConnector.java:240)
    at org.eclipse.mylyn.internal.tasks.core.sync.SynchronizeQueriesJob.synchronizeQuery(SynchronizeQueriesJob.java:311)
    at org.eclipse.mylyn.internal.tasks.core.sync.SynchronizeQueriesJob.synchronizeQueries(SynchronizeQueriesJob.java:268)
    at org.eclipse.mylyn.internal.tasks.core.sync.SynchronizeQueriesJob.run(SynchronizeQueriesJob.java:201)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
Caused by: java.net.SocketException: Can't connect to SOCKS proxy:Connection refused: connect
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at org.eclipse.mylyn.internal.commons.net.MonitoredRequest.connect(MonitoredRequest.java:97)
    at org.eclipse.mylyn.internal.commons.net.PollingProtocolSocketFactory.createSocket(PollingProtocolSocketFactory.java:54)
    at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
    at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
    at org.eclipse.mylyn.commons.net.WebUtil$2.execute(WebUtil.java:332)
    at org.eclipse.mylyn.commons.net.WebUtil$2.execute(WebUtil.java:1)
    at org.eclipse.mylyn.internal.commons.net.MonitoredRequest.call(MonitoredRequest.java:51)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)