Cubari: fix genre parsing (#14712)

src/all/cubari/build.gradle

@@ -6,7 +6,7 @@ ext {
     extName = 'Cubari'
     pkgNameSuffix = "all.cubari"
     extClass = '.CubariFactory'
-    extVersionCode = 15
+    extVersionCode = 16
 }
 
 apply from: "$rootDir/common.gradle"

src/all/cubari/src/eu/kanade/tachiyomi/extension/all/cubari/Cubari.kt

@@ -352,7 +352,13 @@ open class Cubari(override val lang: String) : HttpSource() {
 
             val descriptionFull = jsonObj["description"]?.jsonPrimitive?.content
             description = descriptionFull?.substringBefore("Tags: ") ?: DESCRIPTION_FALLBACK
-            genre = if (descriptionFull!!.contains("Tags: ")) descriptionFull?.substringAfter("Tags: ") else ""
+            genre = descriptionFull?.let {
+                if (it.contains("Tags: ")) {
+                    it.substringAfter("Tags: ")
+                } else {
+                    ""
+                }
+            } ?: ""
 
             url = mangaReference?.url ?: jsonObj["url"]!!.jsonPrimitive.content
             thumbnail_url = jsonObj["coverUrl"]?.jsonPrimitive?.content