Fix issue with blank name in /stats list

Author: ClockVapor

pom.xml

@@ -7,7 +7,7 @@
 
     <groupId>clockvapor.telegram.markov-telegram-bot</groupId>
     <artifactId>markov-telegram-bot</artifactId>
-    <version>0.2.1</version>
+    <version>0.2.2</version>
 
     <properties>
         <kotlin.version>1.3.21</kotlin.version>

src/main/kotlin/clockvapor/telegram/markov/MarkovTelegramBot.kt

@@ -280,7 +280,9 @@ class MarkovTelegramBot(private val token: String, private val dataPath: String)
             val chatMember = response.first?.body()?.result
             if (chatMember != null) {
                 val mostDistinguishingWords = scoreMostDistinguishingWords(wordCounts, universe).keys.take(5)
-                "${chatMember.user.displayName}\n" +
+                "${chatMember.user.displayName.takeIf { it.isNotBlank() }
+                    ?: chatMember.user.username?.takeIf { it.isNotBlank() }
+                    ?: "User ID: $userId"}\n" +
                     mostDistinguishingWords.mapIndexed { i, word -> "${i + 1}. $word" }.joinToString("\n")
             } else null
         }.filter { it.isNotBlank() }.joinToString("\n\n")