fix(api): fix an issue with optional numeric query parameter parsing

api/http/handler/stacks/stack_delete.go

@@ -1,6 +1,7 @@
 package stacks
 
 import (
+	"log"
 	"net/http"
 	"strconv"
 
@@ -22,6 +23,7 @@ func (handler *Handler) stackDelete(w http.ResponseWriter, r *http.Request) *htt
 	}
 
 	externalStack, _ := request.RetrieveBooleanQueryParameter(r, "external", true)
+	log.Printf("External stack value: %v", externalStack)
 	if externalStack {
 		return handler.deleteExternalStack(r, w, stackID)
 	}

api/http/request/request.go

@@ -133,6 +133,9 @@ func RetrieveNumericQueryParameter(request *http.Request, name string, optional
 	if err != nil {
 		return 0, err
 	}
+	if queryParameter == "" && optional {
+		return 0, nil
+	}
 	return strconv.Atoi(queryParameter)
 }