throw if undefined coord systems are used for transform/project calls

modules/Bio/EnsEMBL/Feature.pm

@@ -386,12 +386,16 @@ sub transform {
     throw('Feature is not associated with a slice and may not be transformed');
   }
 
-
   #use db from slice since this feature may not yet be stored in a database
   my $db = $slice->adaptor->db();
   my $cs = $db->get_CoordSystemAdaptor->fetch_by_name($cs_name, $cs_version);
   my $current_cs = $slice->coord_system();
 
+  if(!$cs) {
+    throw("Cannot transform to unknown coordinate system " .
+          "[$cs_name $cs_version]\n");
+  }
+
   # if feature is already in the requested coordinate system, we can just
   # return a copy
   if( $cs->equals( $current_cs ) && $slice->start() == 1 &&

modules/Bio/EnsEMBL/Slice.pm

@@ -606,6 +606,11 @@ sub project {
   my $cs = $csa->fetch_by_name($cs_name, $cs_version);
   my $slice_cs = $self->coord_system();
 
+  if(!$cs) {
+    throw("Cannot project to unknown coordinate system " .
+          "[$cs_name $cs_version]");
+  }
+
   #no mapping is needed if the requested coord system is the one we are in
   #but we do need to check if some of the slice is outside of defined regions
   if($slice_cs->equals($cs)) {