Fix comment endpoint api

Author: rubengees

library/src/main/kotlin/me/proxer/library/api/comment/UpdateCommentEndpoint.kt

@@ -41,7 +41,7 @@ class UpdateCommentEndpoint internal constructor(
      * Sets the rating for the comment. Must be between 0 and 10, while 0 means no rating is given by the user.
      */
     fun rating(rating: Int?): UpdateCommentEndpoint {
-        require(rating in 0..10) {
+        require(rating == null || rating in 0..10) {
             "The rating must be between 0 and 10."
         }
 
@@ -65,7 +65,7 @@ class UpdateCommentEndpoint internal constructor(
     /**
      * Sets the content of the comment. May contain BBCode tags and can be empty.
      */
-    fun comment(comment: String): UpdateCommentEndpoint {
+    fun comment(comment: String?): UpdateCommentEndpoint {
         return this.apply { this.comment = comment }
     }
 

library/src/test/kotlin/me/proxer/library/api/comment/UpdateCommentEndpointTest.kt

@@ -6,6 +6,7 @@ import me.proxer.library.runRequest
 import org.amshove.kluent.invoking
 import org.amshove.kluent.shouldBeNull
 import org.amshove.kluent.shouldEqual
+import org.amshove.kluent.shouldNotThrow
 import org.amshove.kluent.shouldThrow
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.params.ParameterizedTest
@@ -127,4 +128,11 @@ class UpdateCommentEndpointTest : ProxerTest() {
             api.comment.update("0").rating(rating)
         } shouldThrow IllegalArgumentException::class
     }
+
+    @Test
+    fun testRatingValidationNull() {
+        invoking {
+            api.comment.update("0").rating(null)
+        } shouldNotThrow IllegalArgumentException::class
+    }
 }