Fix some useless condition-case forms

Fix some useless condition-case forms

* lisp/progmodes/cperl-mode.el (cperl-calculate-indent):
* lisp/progmodes/verilog-mode.el (verilog--suppressed-warnings):
Add error handler, seemingly the intention here.
* lisp/url/url-gw.el (url-open-stream): Remove condition-case;
it was neutered in 2006.