Fix nil dereference on error (#30740)

In both cases, the `err` is nil because of `if` checks before

Reference: #30729

routers/api/actions/artifacts.go

@@ -466,14 +466,15 @@ func (ar artifactRoutes) downloadArtifact(ctx *ArtifactContext) {
 		log.Error("Error getting artifact: %v", err)
 		ctx.Error(http.StatusInternalServerError, err.Error())
 		return
-	} else if !exist {
+	}
+	if !exist {
 		log.Error("artifact with ID %d does not exist", artifactID)
 		ctx.Error(http.StatusNotFound, fmt.Sprintf("artifact with ID %d does not exist", artifactID))
 		return
 	}
 	if artifact.RunID != runID {
-		log.Error("Error dismatch runID and artifactID, task: %v, artifact: %v", runID, artifactID)
-		ctx.Error(http.StatusBadRequest, err.Error())
+		log.Error("Error mismatch runID and artifactID, task: %v, artifact: %v", runID, artifactID)
+		ctx.Error(http.StatusBadRequest)
 		return
 	}
 

routers/web/repo/actions/view.go

@@ -504,7 +504,7 @@ func getRunJobs(ctx *context_module.Context, runIndex, jobIndex int64) (*actions
 		return nil, nil
 	}
 	if len(jobs) == 0 {
-		ctx.Error(http.StatusNotFound, err.Error())
+		ctx.Error(http.StatusNotFound)
 		return nil, nil
 	}