tpl/inflect: Humanize runtime error

[jmooring]

The inflect.Humanize template function throws an error if the argument consists of whitespace only. For example, each of these throws an error:

{{ inflect.Humanize " " }}
{{ inflect.Humanize "\n" }}
{{ inflect.Humanize "\t" }}

error calling humanize: runtime error: index out of range [0] with length 0

For the record, I wish this function:

1. Called flect.Humanize without doing other things to the string
2. Did not perform flect.Ordinalize; this should be moved to a separate template function

[jmooring]

Upstream:
gobuffalo/flect#74