Attributes with empty string values are removed

[paulyoung]

In the-grid/taylor#42 @bergie has requested that we add a meta tag, like so:

<meta name="the-grid-solution" content="" />

The following:

$ "meta", { name: "the-grid-solution", content: "" }

produces:

<meta name="the-grid-solution" />

I can work around it by using:

$ "meta", { name: "the-grid-solution", content: " " }

or:

"""
<meta name="the-grid-solution" content="" />
"""

I can add a spec if this is confirmed as a bug.

[forresto]

gom/lib/mixins/render.coffee

Line 60 in d56b05c

if val?.length > 0