[REG2.063a] fix issue 10044, and more adding a space after comma

[Issue 2273](http://d.puremagic.com/issues/show_bug.cgi?id=2273) has mostly fixed in 2.061, but some corner cases still remain in di generation.

[Issue 10044](http://d.puremagic.com/issues/show_bug.cgi?id=10044) - Wrong di generation for IsExp with TemplateParameterList