In the fallback check, when Email::Valid is not available, the
extract_valid_address() does not check for success of matching regex,
and $1, which can be undefined, is always returned. Now if match
fails an empty string is returned.

Signed-off-by: Krzysztof Mazur <krzys...@podlesie.net>
---
This fixes following warnings:
Use of uninitialized value in string eq at ./git-send-email.perl line 1017.
Use of uninitialized value in quotemeta at ./git-send-email.perl line 1017.
W: unable to extract a valid address from: x a.patch

when invalid email address was added by --cc-cmd,
./git-send-email.perl --dry-run --to a...@podlesie.net --cc-cmd=echo x a.patch

 git-send-email.perl | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index 5a7c29d..045f25f 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -831,12 +831,12 @@ sub extract_valid_address {
        $address =~ s/^\s*<(.*)>\s*$/$1/;
        if ($have_email_valid) {
                return scalar Email::Valid->address($address);
-       } else {
-               # less robust/correct than the monster regexp in Email::Valid,
-               # but still does a 99% job, and one less dependency
-               $address =~ /($local_part_regexp\@$domain_regexp)/;
-               return $1;
        }
+
+       # less robust/correct than the monster regexp in Email::Valid,
+       # but still does a 99% job, and one less dependency
+       return $1 if $address =~ /($local_part_regexp\@$domain_regexp)/;
+       return "";
 }
 
 # Usually don't need to change anything below here.
-- 
1.8.0.283.gc57d856

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