Tests that blank origins aren't shown in the security panel origins list.

Group: Main origin
Group: Unknown / canceled
<SPAN class=highlighted-url >
    <SPAN class=url-scheme-unknown >
        <#comment >
        </#comment>
https
    </SPAN>
    <SPAN class=url-scheme-separator >
        <#comment >
        </#comment>
://
    </SPAN>
    <SPAN >
        <#comment >
        </#comment>
foo.test
    </SPAN>
</SPAN>
<SPAN class=url-scheme-unknown >
    <#comment >
    </#comment>
https
</SPAN>
<SPAN class=url-scheme-separator >
    <#comment >
    </#comment>
://
</SPAN>
<SPAN >
    <#comment >
    </#comment>
foo.test
</SPAN>