Do not report "incomplete hierarchy" in decompiler

It's fine if the decompiler can't find some classes; it won't do anything
except render their FQ names which are fully available

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/textBuilder/LoggingErrorReporter.kt

@@ -29,7 +29,7 @@ class LoggingErrorReporter(private val log: Logger) : ErrorReporter {
     }
 
     override fun reportIncompleteHierarchy(descriptor: ClassDescriptor, unresolvedSuperClasses: List<String>) {
-        log.error("Incomplete hierarchy for $descriptor. Super classes are not found: $unresolvedSuperClasses")
+        // This is absolutely fine for the decompiler
     }
 
     override fun reportCannotInferVisibility(descriptor: CallableMemberDescriptor) {