In the page_css partial, check array length and presence of $.File before concatenating stylesheets
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					 1 changed files with 15 additions and 3 deletions
				
			
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			@ -15,10 +15,22 @@
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{{ range $stylesheets }}
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  {{ $processedStylesheets = $processedStylesheets | append (. | resources.ExecuteAsTemplate .Name .) }}
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{{ end }}
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{{ if hugo.IsProduction }}
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  {{/*
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    Replace the list of stylesheets that helps with debugging with a
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    concatenated and fingerprinted version.
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  */}}
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  {{ if gt (len $processedStylesheets) 0 }}
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    {{ with $file := $.File }}
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      {{ $outputFilename := printf "%s/page.css" $.File.Dir }}
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      {{ $processedStylesheets = slice ($processedStylesheets
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                           | resources.Concat (printf "%s/page.css" $.File.Dir)
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                              | resources.Concat $outputFilename
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                              | fingerprint "md5") }}
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    {{ else }}
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      {{ warnf "No File for page CSS." }}
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    {{ end }}
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  {{ end }}
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{{ end }}
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{{ return $processedStylesheets }}
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