describe should return all chains with upstream, not only available

src/main/kotlin/io/emeraldpay/dshackle/upstream/CurrentMultistreamHolder.kt

@@ -36,7 +36,7 @@ open class CurrentMultistreamHolder(
 
     override fun getAvailable(): List<Chain> {
         return chainMapping.values.asSequence()
-            .filter { it.isAvailable() }
+            .filter { it.haveUpstreams() }
             .map { it.chain }
             .toList()
     }

src/main/kotlin/io/emeraldpay/dshackle/upstream/Multistream.kt

@@ -349,6 +349,9 @@ abstract class Multistream(
         }
     }
 
+    fun haveUpstreams(): Boolean =
+        upstreams.isNotEmpty()
+
     // --------------------------------------------------------------------------------------------------------
 
     class UpstreamStatus(val upstream: Upstream, val status: UpstreamAvailability, val ts: Instant = Instant.now())