fix: Solves issue where helm-docs would segfault due in charts with c…

…ertain comment format

    The issue was that if a user had a comment which started with the
    old comment format "# field.name -- description", but then underneath had a
    comment of the new format "# -- description", the tool would mark
    the field as having an old style comment, with the key pulled from
    the latter comment "". This meant that we'd try to document the
    root-level mapping node, however the key is `nil` at this point.

pkg/helm/chart_info.go

@@ -286,7 +286,10 @@ func parseChartValuesFileComments(chartDirectory string, values *yaml.Node, lint
 		// If we haven't continued by this point, we didn't match any of the comment formats we want, so we need to add
 		// the in progress value to the map, and reset to looking for a new key
 		key, description := ParseComment(commentLines)
-		keyToDescriptions[key] = description
+		if key != "" {
+			keyToDescriptions[key] = description
+		}
+
 		commentLines = make([]string, 0)
 		foundValuesComment = false
 	}