No more warnings for duplicate unnamed lib imports.

pkg/analyzer/lib/src/generated/error_verifier.dart

Index: pkg/analyzer/lib/src/generated/error_verifier.dart
diff --git a/pkg/analyzer/lib/src/generated/error_verifier.dart b/pkg/analyzer/lib/src/generated/error_verifier.dart
index 9e25a8555177d3ccadb652fa0a579bd458f18448..1839b958dd82fc97445ab25331a881216780aef0 100644
--- a/pkg/analyzer/lib/src/generated/error_verifier.dart
+++ b/pkg/analyzer/lib/src/generated/error_verifier.dart
@@ -2999,13 +2999,7 @@ class ErrorVerifier extends RecursiveAstVisitor<Object> {
     LibraryElement prevLibrary = _nameToExportElement[name];
     if (prevLibrary != null) {
       if (prevLibrary != exportedLibrary) {
-        if (name.isEmpty) {
-          _errorReporter.reportErrorForNode(
-              StaticWarningCode.EXPORT_DUPLICATED_LIBRARY_UNNAMED, directive, [
-            prevLibrary.definingCompilationUnit.displayName,
-            exportedLibrary.definingCompilationUnit.displayName
-          ]);
-        } else {
+        if (!name.isEmpty) {
           _errorReporter.reportErrorForNode(
               StaticWarningCode.EXPORT_DUPLICATED_LIBRARY_NAMED, directive, [
             prevLibrary.definingCompilationUnit.displayName,
@@ -3512,13 +3506,7 @@ class ErrorVerifier extends RecursiveAstVisitor<Object> {
     LibraryElement prevLibrary = _nameToImportElement[name];
     if (prevLibrary != null) {
       if (prevLibrary != nodeLibrary) {
-        if (name.isEmpty) {
-          _errorReporter.reportErrorForNode(
-              StaticWarningCode.IMPORT_DUPLICATED_LIBRARY_UNNAMED, directive, [
-            prevLibrary.definingCompilationUnit.displayName,
-            nodeLibrary.definingCompilationUnit.displayName
-          ]);
-        } else {
+        if (!name.isEmpty) {
           _errorReporter.reportErrorForNode(
               StaticWarningCode.IMPORT_DUPLICATED_LIBRARY_NAMED, directive, [
             prevLibrary.definingCompilationUnit.displayName,