fix: ensure errors are passed back from stream-to-value

Author: dirkmc

src/utils/stream-to-value.js

@@ -7,14 +7,12 @@ const concat = require('concat-stream')
   Concatenate a stream to a single value.
 */
 function streamToValue (response, callback) {
+  let data
   pump(
     response,
-    concat((data) => callback(null, data)),
-    (err) => {
-      if (err) {
-        callback(err)
-      }
-    })
+    concat((d) => { data = d }),
+    (err) => callback(err, data)
+  )
 }
 
 module.exports = streamToValue