Return null instead of dying when can't find tile

HexGrid.pm

@@ -90,7 +90,7 @@ sub get_tile_at($this, $nw, $sw)
 	{
 		return $this->{regions}{$region}{tiles}{$nw}{$sw} if exists $this->{regions}{$region}{tiles}{$nw}{$sw};
 	}
-	croak "No tile at $nw,$sw";
+	return;
 }
 sub get_tile_and_region_at($this, $nw, $sw)
 {
@@ -98,7 +98,7 @@ sub get_tile_and_region_at($this, $nw, $sw)
 	{
 		return ($region->{tiles}{$nw}{$sw}, $region) if exists $region->{tiles}{$nw}{$sw};
 	}
-	croak "No tile at $nw,$sw";
+	return;
 }
 
 # Clones settings
@@ -138,6 +138,16 @@ sub subgrid_for_tiles($this, @coords_list)
 	foreach my $coords (@coords_list)
 	{
 		my ($tile, $region) = $this->get_tile_and_region_at($coords->{nw}, $coords->{sw});
+		unless ($tile)
+		{
+			carp "No tile at " . $coords->{nw} . "," . $coords->{sw}, skipping.
+			next;
+		}
+		unless ($region)
+		{
+			carp "No region at " . $coords->{nw} . "," . $coords->{sw}, skipping.
+			next;
+		}
 		unless(exists $subgrid->{regions}{$region->{name}})
 		{
 			my $clone = $region->clone;

wiki-map.pl

@@ -177,7 +177,6 @@ foreach my $page (values %{$location_query_results->{query}{pages}})
 			foreach my $coords (split /;/, $parsed_template->{named_params}{context_tiles})
 			{
 				do { carp "Skipping bad spec: $coords"; next; } unless $coords =~ $coords_regex;
-				# $location_with_context->add_tile($grid->get_tile_at($1, $2));
 				push @coords_list, { nw => $1, sw => $2 };
 			}
 			my $location_grid = $grid->subgrid_for_tiles(@coords_list);
@@ -197,8 +196,6 @@ foreach my $page (values %{$location_query_results->{query}{pages}})
 
 
 
-# HexGrid::Image::DEBUG();
-
 say STDERR "Getting Background image pages";
 my $background_query_results = $mw->api({ action => 'query',
 		prop => 'imageinfo',
@@ -286,6 +283,12 @@ foreach my $site_page_ref (values %{$site_query_results->{query}{pages}})
 	my $parsed_template = MWTemplate::Parse($site_content, $site_template_name);
 	next unless $parsed_template;
 	my ($nw,$sw) = split /,/, $parsed_template->{named_params}{coords};
+	my $tile = $grid->get_tile_at($nw, $sw);
+	unless($tile)
+	{
+		carp "Coordinates of Site $site_name do not appear in the grid, skipping.";
+		next;
+	}
 
 	my $imageinfo_query_results = $mw->api({ action => 'query',
 			prop => 'imageinfo',
@@ -304,7 +307,7 @@ foreach my $site_page_ref (values %{$site_query_results->{query}{pages}})
 		link => $site_url,
 		description => $parsed_template->{named_params}{abstract}
 	);
-	$grid->get_tile_at($nw, $sw)->pin($pin);
+	$tile->pin($pin);
 }
 
 my (%path_specs);