fix the nil substitution in %s (#1837)

Author: motatoes

cli/pkg/spec/spec.go

@@ -145,7 +145,7 @@ func RunSpec(
 
 	currentDir, err := os.Getwd()
 	if err != nil {
-		message := fmt.Sprintf("Failed to get current dir. %s", err)
+		message := fmt.Sprintf("Failed to get current dir. %v", err)
 		reportError(spec, backendApi, message, err)
 	}
 
@@ -154,12 +154,12 @@ func RunSpec(
 	if !allAppliesSuccess || err != nil {
 		serializedBatch, reportingError := backendApi.ReportProjectJobStatus(spec.VCS.RepoName, spec.Job.ProjectName, spec.JobId, "failed", time.Now(), nil, "", "", "", nil)
 		if reportingError != nil {
-			message := fmt.Sprintf("Failed run commands. %s", err)
+			message := fmt.Sprintf("Failed run commands. %v", err)
 			reportError(spec, backendApi, message, err)
 		}
 		commentUpdater.UpdateComment(serializedBatch.Jobs, serializedBatch.PrNumber, prService, commentId)
 		digger.UpdateAggregateStatus(serializedBatch, prService)
-		reportError(spec, backendApi, fmt.Sprintf("Failed to run commands. %s", err), err)
+		reportError(spec, backendApi, fmt.Sprintf("failed to run commands %v", err), err)
 	}
 	usage.ReportErrorAndExit(spec.VCS.RepoOwner, "Digger finished successfully", 0)