MT#64295 better handling of via_route empty string

* transform via_route empty string into undef and store
  it as undef without validating it against SIP-URI

Change-Id: Iefae7b26910201183ae3d049b3785a68dc81ce64
(cherry picked from commit c417cc622d)

lib/NGCP/Panel/Form/Peering/Server.pm

@@ -137,6 +137,8 @@ sub transform_via_route {
 
     $uri =~ s/^\s*([^\s]+)\s*$/$1/g;
 
+    $uri || return;
+
     unless ($uri =~ /^</) {
         $uri = '<' . $uri . ';lr>';
     }
@@ -152,7 +154,7 @@ sub transform_via_route {
 sub validate_via_route {
     my ($self, $field) = @_;
 
-    my $uri = $field->value;
+    my $uri = $field->value || return;
 
     unless ($field->value =~ /^<?sip\:[^\s]+:\d+;lr>?$/) {
         $field->add_error("Invalid SIP URI, must be a valid SIP URI in the form of sip:ip:port");

lib/NGCP/Panel/Role/API/PeeringServers.pm

@@ -72,13 +72,17 @@ sub pre_process_form_resource {
 
     $uri =~ s/^\s*([^\s]+)\s*$/$1/g;
 
-    unless ($uri =~ /^</) {
-        $uri = '<' . $uri . ';lr>';
-    }
-
-    unless ($uri =~ /;lr>$/) {
-        $uri =~ s/>$//;
-        $uri = $uri . ';lr>';
+    if ($uri) {
+        unless ($uri =~ /^</) {
+            $uri = '<' . $uri . ';lr>';
+        }
+
+        unless ($uri =~ /;lr>$/) {
+            $uri =~ s/>$//;
+            $uri = $uri . ';lr>';
+        }
+    } else {
+        $uri = undef;
     }
 
     $resource->{via_route} = $uri;