properly return error values if a server error occurs

app/routes/backups.go

@@ -26,6 +26,7 @@ func HandleGETBackups(c *gin.Context) {
 		vm_path, err := common.ExtractVMPath(c)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 
 		backups, err := GetInstanceBackups(vm_path, auth)
@@ -57,6 +58,7 @@ func HandleGETBackupsFragment(c *gin.Context) {
 		vm_path, err := common.ExtractVMPath(c)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 
 		backups, err := GetInstanceBackups(vm_path, auth)

app/routes/config.go

@@ -52,6 +52,7 @@ func HandleGETConfig(c *gin.Context) {
 		vm_path, err := common.ExtractVMPath(c)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 
 		config, err := GetInstanceConfig(vm_path, auth)
@@ -87,6 +88,7 @@ func HandleGETConfigVolumesFragment(c *gin.Context) {
 		vm_path, err := common.ExtractVMPath(c)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 
 		config, err := GetInstanceConfig(vm_path, auth)
@@ -110,6 +112,7 @@ func HandleGETConfigNetsFragment(c *gin.Context) {
 		vm_path, err := common.ExtractVMPath(c)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 
 		config, err := GetInstanceConfig(vm_path, auth)
@@ -133,6 +136,7 @@ func HandleGETConfigDevicesFragment(c *gin.Context) {
 		vm_path, err := common.ExtractVMPath(c)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 
 		config, err := GetInstanceConfig(vm_path, auth)
@@ -156,6 +160,7 @@ func HandleGETConfigBootFragment(c *gin.Context) {
 		vm_path, err := common.ExtractVMPath(c)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 
 		config, err := GetInstanceConfig(vm_path, auth)

app/routes/index.go

@@ -50,6 +50,7 @@ func HandleGETIndex(c *gin.Context) {
 		instances, _, err := GetClusterResources(auth)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 		page := gin.H{
 			"global":    common.Global,
@@ -68,6 +69,7 @@ func HandleGETInstancesFragment(c *gin.Context) {
 		instances, _, err := GetClusterResources(auth)
 		if err != nil {
 			common.HandleNonFatalError(c, err)
+			return
 		}
 		c.Header("Content-Type", "text/plain")
 		common.TMPL.ExecuteTemplate(c.Writer, "html/index-instances.go.tmpl", gin.H{