title: Delete all visible cookies raises an exception
body: <p>I am using selenium with a python client. When doing selenium.delete_all_visible_cookies I get the exception: <br></p>
  
  <blockquote>
    <p>ERROR: Command execution failure.
    Please search the forum at
    <a href="http://clearspace.openqa.org" rel="nofollow noreferrer">http://clearspace.openqa.org</a> for error
    details from the log window.  The
    error message is: malformed URI
    sequence</p>
  </blockquote>
  
  <p>The log window's error is:</p>
  
  <pre><code>error(1254427481456): Exception details: 
  message -&gt; malformed URI sequence, 
  fileName -&gt; http://localhost:4444/selenium-server/core/scripts/selenium-browserbot.js,
  lineNumber -&gt; 1169, 
  stack -&gt; 
  ("WSS_GW",[object HTMLDocument])@http://localhost:4444/selenium-server/core/scripts/selenium-browserbot.js:1169 
  ("WSS_GW",".mysite","/",[object HTMLDocument])@http://localhost:4444/selenium-server/core/scripts/selenium-browserbot.js:1208 
  ("WSS_GW",".mysite","/",[object HTMLDocument])@http://localhost:4444/selenium-server/core/scripts/selenium-browserbot.js:1213 
  ("WSS_GW",".mysite","/",[object HTMLDocument])@http://localhost:4444/selenium-server/core/scripts/selenium-browserbot.js:1236 
  ("WSS_GW","mysite","/",[object XPCCrossOriginWrapper])@http://localhost:4444/selenium-server/core/scripts/selenium-browserbot.js:1248 
  ("","")@http://localhost:4444/selenium-server/core/scripts/selenium-api.js:2607
  ("","")@http://localhost:4444/selenium-server/core/scripts/htmlutils.js:60 
  ([object Object],[object Object])@http://localhost:4444/selenium-server/core/scripts/selenium-commandhandlers.js:310 
  ()@http://localhost:4444/selenium-server/core/scripts/selenium-executionloop.js:112 
  (-10)@http://localhost:4444/selenium-server/core/scripts/selenium-executionloop.js:78 
  (-10)@http://localhost:4444/selenium-server/core/scripts/htmlutils.js:60 , 
  name -&gt; URIError
  </code></pre>
  
  <p>Any idea what's going on?</p>