Apply suggestions from code review

Co-authored-by: George Jenkins <gvjenkins@gmail.com>
Signed-off-by: Yarden Shoham <git@yardenshoham.com>

pkg/postrender/exec.go

@@ -67,7 +67,7 @@ func (p *execRender) Run(renderedManifests *bytes.Buffer) (*bytes.Buffer, error)
 	// If the binary returned almost nothing, it's likely that it didn't
 	// successfully render anything
 	if len(bytes.TrimSpace(postRendered.Bytes())) == 0 {
-		return nil, errors.Errorf("post render binary %s did not produce any output %s", p.binaryPath, postRendered.String())
+		return nil, errors.Errorf("post-renderer %q produced empty output", p.binaryPath)
 	}
 
 	return postRendered, nil