fix get

Author: weilerN

pkg/ingressCache/pathTrie.go

@@ -80,6 +80,10 @@ func (p *PathTree) DeleteFunctionName(path string, function string) error {
 // GetFunctionName retrieve the closest prefix matching the path and returns the associated functions
 func (p *PathTree) GetFunctionName(path string) ([]string, error) {
 	var walkPathResult interface{}
+	if path == "" {
+		return nil, errors.New("path is empty")
+	}
+
 	if err := p.t.WalkPath(path, func(_ string, value interface{}) error {
 		if value != nil {
 			walkPathResult = value