Bug with Hash URL

[blond]

Should ignore hash url.

@import url("#");

If the processed file with hash url we get an error:

/Users/blond/projects/postcss-import/node_modules/postcss-message-helpers/index.js:79
    throw err
          ^
Error: <css input>:15:1: Failed to find '#' from /Users/blond/projects/postcss-import
    in [ 
        /Users/blond/projects/postcss-import/test/fixtures/imports
    ]
    at <css input>:15:1
    at resolveFilename (/Users/blond/projects/postcss-import/index.js:326:11)
    at readAtImport (/Users/blond/projects/postcss-import/index.js:149:26)
    at transformAtImport (/Users/blond/projects/postcss-import/index.js:87:7)
    at Object.tryCatch [as try] (/Users/blond/projects/postcss-import/node_modules/postcss-message-helpers/index.js:53:12)
    at /Users/blond/projects/postcss-import/index.js:86:16
    at Array.forEach (native)
    at parseStyles (/Users/blond/projects/postcss-import/index.js:85:11)
    at /Users/blond/projects/postcss-import/index.js:67:5
    at PostCSS.process (/Users/blond/projects/postcss-import/node_modules/postcss/lib/postcss.js:79:28)
    at compareFixtures (/Users/blond/projects/postcss-import/test/index.js:22:6)