fix: categories.0.iconUrl could be null

Author: z0z0r4

src/models/curseforge/entities.rs

@@ -16,7 +16,7 @@ pub struct Category {
     pub slug: Option<String>,
     pub url: String,
     #[serde(rename = "iconUrl")]
-    pub icon_url: String,
+    pub icon_url: Option<String>,
     #[serde(
         rename = "dateModified",
         deserialize_with = "chrono_datetime_as_bson_datetime::deserialize"

src/models/curseforge/responses.rs

@@ -13,7 +13,7 @@ pub struct Category {
     pub game_id: i32,
     pub name: String,
     pub slug: Option<String>,
-    pub url: String,
+    pub url: Option<String>,
     #[serde(rename = "iconUrl")]
     pub icon_url: String,
     #[serde(rename = "dateModified")]