Referring to an empty hyperscript file throws an error

[cemerick]

Adding e.g. <script type_="text/hyperscript" src="/scripts._hs" /> when scripts._hs is empty results in e.g.

Uncaught (in promise) RangeError: Invalid count value
    at String.repeat (<anonymous>)
    at hyperscript-0.9.5-2839a7f.js:1:9892
    at Object.c [as raiseParseError] (hyperscript-0.9.5-2839a7f.js:1:9939)
    at hyperscript-0.9.5-2839a7f.js:1:11322
    at hyperscript-0.9.5-2839a7f.js:1:9423
    at Object.i [as parseElement] (hyperscript-0.9.5-2839a7f.js:1:9535)
    at hyperscript-0.9.5-2839a7f.js:1:35679
    at hyperscript-0.9.5-2839a7f.js:1:9423
    at i (hyperscript-0.9.5-2839a7f.js:1:9535)
    at Object.l [as parseAnyOf] (hyperscript-0.9.5-2839a7f.js:1:9658)