org-hugo--quote-string now returns an empty quoted string by default

ox-hugo.el

@@ -2386,12 +2386,15 @@ If VAL contains newlines, format it according to TOML or YAML
 FORMAT to preserve them.
 
 VAL is returned as-it-is under the following cases:
-- It is a number or nil.
+- It is a number.
 - It is a string and is already wrapped with double quotes.
 - It is a string and it's value is \"true\" or \"false\".
 - It is a string representing a date.
 - It is a string representing an integer or float.
 
+If VAL is nil or an empty string, a quoted empty string \"\" is
+returned.
+
 If optional argument PREFER-NO-QUOTES is non-nil, return the VAL
 as-it-is if it's a string with just alphanumeric characters.
 
@@ -2475,9 +2478,9 @@ Optional argument FORMAT can be \"toml\" or \"yaml\"."
         (setq val (replace-regexp-in-string "\"" "\\\\\""  val))
         (concat "\"" val "\""))))
      (t                                 ;If `val' is any empty string
-      "")))
+      "\"\"")))
    (t                            ;Return empty string if anything else
-    "")))
+    "\"\"")))
 
 (defun org-hugo--parse-property-arguments (str)
   "Return an alist converted from a string STR of Hugo property value.

test/site/content-org/all-posts.org

@@ -1705,6 +1705,7 @@ Here there is white space in menu name property.
 :EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :alpha 1
 :EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :beta "two words"
 :EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :gamma 10
+:EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :empty_string ""
 :END:
 From [[https://orgmode.org/manual/Property-syntax.html][*(org) Property syntax*]]:
 #+begin_quote
@@ -1755,6 +1756,7 @@ The following results in the 'genres' property having the value
 :EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :header '((image . "projects/Readingabook.jpg") (caption . "stay hungry, stay foolish"))
 :EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :collection '((animals . (dog cat "penguin" "mountain gorilla")) (nothing) (nonnil . t) (strings-symbols . ("abc" def "two words")) (integers . (123 -5 17 1_234)) (floats . (12.3 -5.0 -17E-6)) (booleans . (true false)))
 :EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :random '((foo . bar))
+:EXPORT_HUGO_CUSTOM_FRONT_MATTER+: :empty_string_value '((empty . ""))
 :END:
 *** Custom front matter with nested maps in TOML
 :PROPERTIES:

test/site/content/posts/custom-front-matter-with-nested-maps-toml.md

@@ -20,6 +20,8 @@ draft = false
   booleans = [true, false]
 [random]
   foo = "bar"
+[empty_string_value]
+  empty = ""
 +++
 
 `ox-hugo` Issue #[139](https://github.com/kaushalmodi/ox-hugo/issues/139)

test/site/content/posts/custom-front-matter-with-nested-maps-yaml.md

@@ -20,6 +20,8 @@ collection:
   booleans: [true, false]
 random:
   foo: "bar"
+empty_string_value:
+  empty: ""
 ---
 
 `ox-hugo` Issue #[139](https://github.com/kaushalmodi/ox-hugo/issues/139)

test/site/themes/hugo-bare-min-theme

@@ -1 +1 @@
-Subproject commit 1fa02cddc3419e7183031946e3114eaf08bcb21d
+Subproject commit d5faea081a4e7ef06b633a9921726c0083ce07e2