validators, test: permissive typeless validateReference()

Test appears to describe that the original behavior would have
been to default to 'track', which like... okay??

That is so and was changed (to no default and arbitrary typeless
behavior) in commit 4f6e0bc3.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/validators.js b/src/validators.js
index 59df80d4..63268ded 100644
--- a/src/validators.js
+++ b/src/validators.js
@@ -842,9 +842,11 @@ export function validateReference(type) {
             type.map(type => `"${type}:"`).join(', ') +
             `, got "${typePart}:"`);
         }
-      } else if (typePart !== type) {
-        throw new TypeError(
-          `Expected ref to begin with "${type}:", got "${typePart}:"`);
+      } else if (type) {
+        if (typePart !== type) {
+          throw new TypeError(
+            `Expected ref to begin with "${type}:", got "${typePart}:"`);
+        }
       }
 
       isDirectory(directoryPart);