Don't care about empty lines in the diff

Author: coke

xt/rakuast-compare.rakutest

@@ -54,6 +54,11 @@ for @files -> $file {
         # Ignore space differences
         $old ~~ s:g/ ' '+ / /;
         $new ~~ s:g/ ' '+ / /;
+
+        # Ignore blank lines
+        $old ~~ s:g/ ^^ $$ . //;
+        $new ~~ s:g/ ^^ $$ . //;
+
     }
     ok $old eq $new, "$file contents match";
     if %*ENV<RAKUDO_AST_DOCS>:exists && %*ENV<RAKUDO_AST_DOCS> eq "v" {