InfluxDB: Fix invalid memory address or nil pointer dereference when schema is missing in URL (#25565)

Add guard if parsing url fails in influxdb backend data source.

Fixes #25242

(cherry picked from commit bd8a04a6a5)

pkg/tsdb/influxdb/influxdb.go

@@ -113,7 +113,10 @@ func (e *InfluxDBExecutor) getQuery(dsInfo *models.DataSource, queries []*tsdb.Q
 
 func (e *InfluxDBExecutor) createRequest(dsInfo *models.DataSource, query string) (*http.Request, error) {
 
-	u, _ := url.Parse(dsInfo.Url)
+	u, err := url.Parse(dsInfo.Url)
+	if err != nil {
+		return nil, err
+	}
 	u.Path = path.Join(u.Path, "query")
 	httpMode := dsInfo.JsonData.Get("httpMode").MustString("GET")