Manual test suite (reproducibility): point tester to info earlier, add fallback plan on failure

Yesterday the TR wrote "but I need to know the TR", while this info
was available a bit further on the pad. Let's point them to it
earlier, and while I'm at it, offer a way forward when the info
is actually missing.

wiki/src/contribute/release_process/test.mdwn

@@ -59,6 +59,11 @@ In a directory with many Tails ISO and USB images:
 
 This section can **not** be done by the RM.
 
+0. Check that the <https://tails.boum.org/contribute/calendar/>
+   documents who is the _Trusted Reproducer_ for this release.
+   If this is not the case, ask the RM (this is the only exception
+   to "do not trust anything said by the RM about this process").
+
 1. Download the ISO and USB images.
 
 2. Clear-sign the hashes of all products using your OpenPGP key
@@ -77,8 +82,7 @@ This section can **not** be done by the RM.
         echo "$DEST_DIR/TR-bits.gz"
 
 4. Send the aforementioned generated file as an attachment
-   to the _Trusted Reproducer_, whose name is on
-   <https://tails.boum.org/contribute/calendar/>.
+   to the _Trusted Reproducer_.
 
 5. If the _Trusted Reproducer_ is around, ask them: