fix generated blackboxes for ecp5

techlibs/lattice/cells_bb_ecp5.v

@@ -1580,7 +1580,6 @@ module EXTREFB (...);
     (* iopad_external_pin *)
     input REFCLKN;
     output REFCLKO;
-    output ;
 endmodule
 
 (* blackbox *) (* keep *)
@@ -2172,6 +2171,5 @@ module DCUA (...);
     output D_COUT19;
     input D_REFCLKI;
     output D_FFS_PLOL;
-    output ;
 endmodule
 

techlibs/lattice/cells_xtra.py

@@ -815,6 +815,8 @@ def xtract_cells_decl(device, cells, dirs, outf):
                 if l.endswith((';', ',', ")")):
                     l = l[:-1]
                 l = l.replace(")","")
+                if l == "":
+                    continue
                 if ';' in l:
                     print('Weird port line in {} [{}].'.format(fname, l))
                     sys.exit(1)