Skip phone messages if patron has no phone number to call

Koha/Plugin/Com/ByWaterSolutions/TwilioVoice.pm

@@ -99,7 +99,6 @@ sub before_send_messages {
             if ($other_messages->count) {
                 $m->status('deleted');    # As close a status to 'skipped' as we have
                 $m->update();
-
                 next;
             }
         }
@@ -109,6 +108,12 @@ sub before_send_messages {
 
         my $phone = $patron->phone || $patron->mobile;
 
+        unless ( $phone ) {
+            $m->status('failed');
+            $m->update();
+            next;
+        }
+
         # Normalize the phone number to E.164 format, Twilio has a convenient ( and free ) API for this.
         my $ua      = LWP::UserAgent->new;
         my $request = HTTP::Request->new(GET => "https://lookups.twilio.com/v1/PhoneNumbers/$phone?CountryCode=US");