fix: add blank lines on empty seeds (#41348)

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comment-your-javascript-code.md

@@ -51,6 +51,7 @@ assert(code.match(/(\/\*)([^\/]{5,})(?=\*\/)/gm));
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-javascript-variables.md

@@ -51,6 +51,7 @@ if(typeof myName !== "undefined"){(function(v){return v;})(myName);}
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/declare-string-variables.md

@@ -68,6 +68,7 @@ if(typeof myFirstName !== "undefined" && typeof myLastName !== "undefined"){(fun
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/initializing-variables-with-the-assignment-operator.md

@@ -38,6 +38,7 @@ if(typeof a !== 'undefined') {(function(a){return "a = " + a;})(a);} else { (fun
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/passing-values-to-functions-with-arguments.md

@@ -107,6 +107,7 @@ if (typeof functionWithArgs !== "function") {
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/return-a-value-from-a-function-with-return.md

@@ -59,6 +59,7 @@ assert(timesFive(0) === 0);
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/write-reusable-javascript-with-functions.md

@@ -89,6 +89,7 @@ if (typeof reusableFunction !== "function") {
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/create-a-javascript-promise.md

@@ -43,6 +43,7 @@ assert(
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/object-oriented-programming/define-a-constructor-function.md

@@ -53,6 +53,7 @@ assert(typeof new Dog().numLegs === 'number');
 ## --seed-contents--
 
 ```js
+
 ```
 
 # --solutions--