fix: empty properties if one of them has an empty value

package.json

@@ -110,7 +110,7 @@
         "ignore": "5.1.8",
         "is-svg": "4.3.0",
         "jszip": "3.7.0",
-        "mldoc": "^1.4.9",
+        "mldoc": "^1.5.0",
         "path": "0.12.7",
         "pixi-graph-fork": "0.2.0",
         "pixi.js": "6.2.0",

yarn.lock

@@ -4702,10 +4702,10 @@ mkdirp@^1.0.3:
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-1.0.4.tgz#3eb5ed62622756d79a5f0e2a221dfebad75c2f7e"
   integrity sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==
 
-mldoc@^1.4.9:
-  version "1.4.9"
-  resolved "https://registry.yarnpkg.com/mldoc/-/mldoc-1.4.9.tgz#a61d93e98f19bf4ec6303810cc3573c5e14eab44"
-  integrity sha512-rroc1tWJnNm2n33MYk+sWgLjGWmP93Am+6zvpBe0BGEyccHQT3AxHHv8fNpF7HVvT7YPtU/dtHWTh6nE2n7vPA==
+mldoc@^1.5.0:
+  version "1.5.0"
+  resolved "https://registry.yarnpkg.com/mldoc/-/mldoc-1.5.0.tgz#c1250115ef320ec3eaf9717dd65730b041d78e7b"
+  integrity sha512-V1HSNCOkeWRukQPfOdUv12wMKeNSVNzz2AIvjsmi/C8fakimoOt5oJA+H+r1bNf+7j9PBtagEzbrTTRKoOmqpw==
   dependencies:
     yargs "^12.0.2"