Remove assertion

This assertion is too strong in some we have an under-constrained
expression for which the error has still not been emitted.

Author: nicolasstucki

compiler/src/dotty/tools/dotc/ast/tpd.scala

@@ -1184,10 +1184,7 @@ object tpd extends Trees.Instance[Type] with TypedTreeInfo {
       val baseType = tree.tpe.baseType(defn.QuotedExprClass)
       val argType =
         if (baseType != NoType) baseType.argTypesHi.head
-        else {
-          assert(ctx.reporter.hasErrors)
-          defn.NothingType
-        }
+        else defn.NothingType
       ref(defn.InternalQuoted_exprSplice).appliedToType(argType).appliedTo(tree)
     }
     def unapply(tree: Tree)(implicit ctx: Context): Option[Tree] = tree match {