Check whether testsuite triggers have any binaries

We should only run autopkgtests for testsuite triggers if the source
package has any binaries on the relevant architecture, as otherwise it
should be expected to fail.

britney2/policies/autopkgtest.py

@@ -375,8 +375,11 @@ class AutopkgtestPolicy(BasePolicy):
                     except KeyError:
                         continue
                     if 'autopkgtest' in tdep_src_info.testsuite or self.has_autodep8(tdep_src_info, binaries_info):
-                        tests.append((tdep_src, tdep_src_info[VERSION]))
-                        reported_pkgs.add(tdep_src)
+                        for pkg_id in tdep_src_info.binaries:
+                            if pkg_id.architecture == arch:
+                                tests.append((tdep_src, tdep_src_info[VERSION]))
+                                reported_pkgs.add(tdep_src)
+                                break
 
         # Hardcode linux-meta →  linux, lxc, glibc, systemd triggers until we get a more flexible
         # implementation: https://bugs.debian.org/779559