Fix: switch context fails after failed connection

Fixes derailed#3032

It should not fail to invalidate the cache when there is not cached
connection.

internal/client/client.go

@@ -458,10 +458,12 @@ func (a *APIClient) RestConfig() (*restclient.Config, error) {
 	return a.config.RESTConfig()
 }
 
+var NoConnectionToCachedDial = errors.New("no connection to cached dial")
+
 // CachedDiscovery returns a cached discovery client.
 func (a *APIClient) CachedDiscovery() (*disk.CachedDiscoveryClient, error) {
 	if !a.getConnOK() {
-		return nil, errors.New("no connection to cached dial")
+		return nil, NoConnectionToCachedDial
 	}
 
 	if c := a.getCachedClient(); c != nil {
@@ -546,7 +548,11 @@ func (a *APIClient) SwitchContext(name string) error {
 		return err
 	}
 	if err := a.invalidateCache(); err != nil {
-		return err
+		if err == NoConnectionToCachedDial {
+			log.Warn().Err(err).Msgf("No cache to invalidate")
+		} else {
+			return err
+		}
 	}
 	a.reset()
 	ResetMetrics()