Errors on site without expected parameters set

[paskal]

Hello!

$subj, when trying to run this theme against my blog source I get following:

Building sites … ERROR 2018/03/20 19:04:10 Error while rendering "page" in "post/": template: theme/_default/single.html:1:3: executing "theme/_default/single.html" at <partial "header.html...>: error calling partial: template: theme/partials/header.html:6:46: executing "theme/partials/header.html" at <index .Site.Params.t...>: error calling index: index of untyped nil
ERROR 2018/03/20 19:04:10 Error while rendering "page" in "": template: theme/_default/single.html:1:3: executing "theme/_default/single.html" at <partial "header.html...>: error calling partial: template: theme/partials/header.html:6:46: executing "theme/partials/header.html" at <index .Site.Params.t...>: error calling index: index of untyped nil
ERROR 2018/03/20 19:04:11 Error while rendering "taxonomy" in "": template: theme/_default/list.html:1:3: executing "theme/_default/list.html" at <partial "header.html...>: error calling partial: template: theme/partials/header.html:6:46: executing "theme/partials/header.html" at <index .Site.Params.t...>: error calling index: index of untyped nil
ERROR 2018/03/20 19:04:11 Error while rendering "home" in "": template: theme/_default/list.html:1:3: executing "theme/_default/list.html" at <partial "header.html...>: error calling partial: template: theme/partials/header.html:6:46: executing "theme/partials/header.html" at <index .Site.Params.t...>: error calling index: index of untyped nil
ERROR 2018/03/20 19:04:11 Error while rendering "section" in "": template: theme/_default/list.html:1:3: executing "theme/_default/list.html" at <partial "header.html...>: error calling partial: template: theme/partials/header.html:6:46: executing "theme/partials/header.html" at <index .Site.Params.t...>: error calling index: index of untyped nil
ERROR 2018/03/20 19:04:11 Error while rendering "taxonomyTerm" in "": template: theme/_default/terms.html:1:3: executing "theme/_default/terms.html" at <partial "header.html...>: error calling partial: template: theme/partials/header.html:6:46: executing "theme/partials/header.html" at <index .Site.Params.t...>: error calling index: index of untyped nil
ERROR 2018/03/20 19:04:11 Error while rendering "404" in "": template: theme/404.html:1:3: executing "theme/404.html" at <partial "header.html...>: error calling partial: template: theme/partials/header.html:6:46: executing "theme/partials/header.html" at <index .Site.Params.t...>: error calling index: index of untyped nil

The reason is likely some absent .Site. parameter but you can't tell it from error message, I guess input parameters handling could be improved. cboettig/hugo-now-ui#9 might be used as reference point.

[paskal]

victoriadrake/hugo-theme-sam#3 is an example of how this can be fixed.