Handle null checks for 'comments' in ModuleInfo methods

Added null checks to prevent potential NullPointerExceptions in methods interacting with the 'comments' map. This ensures safer handling of cases where 'comments' might be undefined or uninitialized.

Author: ddemiral

src/main/java/com/chaoticsomeone/ModInfGen/model/ModuleInfo.java

@@ -105,8 +105,10 @@ public void expandVariables() {
 			setExports(getExports().stream().map(variableMapper).toList());
 			setLegacy(getLegacy().stream().map(variableMapper).toList());
 
-			for (String commentKey : comments.keySet()) {
-				comments.put(commentKey, variableMapper.apply(comments.get(commentKey)));
+			if (comments != null) {
+				for (String commentKey : comments.keySet()) {
+					comments.put(commentKey, variableMapper.apply(comments.get(commentKey)));
+				}
 			}
 
 			for (OpensDeclaration open : opens) {
@@ -185,6 +187,10 @@ public void setComments(Map<String, String> comments) {
 	}
 
 	public String getComment(String key) {
+		if (comments == null) {
+			return null;
+		}
+
 		return comments.get(key);
 	}