Strip trailing commas for created signed-by fingerprint lists

This prevented some sources.list entries from working, an example
of which can be found in the test.

1 files changed, 2 insertions, 0 deletions

diff --git a/apt-pkg/deb/debmetaindex.cc b/apt-pkg/deb/debmetaindex.cc
index ead07a479..aad7df735 100644
--- a/apt-pkg/deb/debmetaindex.cc
+++ b/apt-pkg/deb/debmetaindex.cc
@@ -687,6 +687,8 @@ bool debReleaseIndex::SetSignedBy(std::string const &pSignedBy)
 	 std::stringstream os;
 	 std::copy(fingers.begin(), fingers.end(), std::ostream_iterator<std::string>(os, ","));
 	 SignedBy = os.str();
+	 while (SignedBy[SignedBy.size() - 1] == ',')
+	    SignedBy.resize(SignedBy.size() - 1);
       }
    }
    else if (SignedBy != pSignedBy)