Merge pull request #500 from influxdata/fix-server-no-return

Fix several handlers that were not returning after error

server/exploration.go

@@ -183,6 +183,7 @@ func (h *Service) NewExploration(w http.ResponseWriter, r *http.Request) {
 	if err != nil {
 		msg := fmt.Errorf("Error: Failed to save Exploration")
 		unknownErrorWithMessage(w, msg)
+		return
 	}
 
 	res := newExploration(e)

server/layout.go

@@ -45,6 +45,7 @@ func (h *Service) NewLayout(w http.ResponseWriter, r *http.Request) {
 	if layout, err = h.LayoutStore.Add(r.Context(), layout); err != nil {
 		msg := fmt.Errorf("Error storing layout %v: %v", layout, err)
 		unknownErrorWithMessage(w, msg)
+		return
 	}
 
 	res := newLayoutResponse(layout)

server/mappings.go

@@ -17,6 +17,7 @@ func (h *Service) GetMappings(w http.ResponseWriter, r *http.Request) {
 	layouts, err := h.LayoutStore.All(ctx)
 	if err != nil {
 		Error(w, http.StatusInternalServerError, "Error loading layouts")
+		return
 	}
 
 	mp := getMappingsResponse{