Address review feedback; stop using result of 'what'

include/grpc++/impl/codegen/method_handler_impl.h

@@ -40,10 +40,8 @@ Status CatchingFunctionHandler(Callable&& handler) {
 #if GRPC_ALLOW_EXCEPTIONS
   try {
     return handler();
-  } catch (const std::exception& e) {
-    return Status(StatusCode::UNKNOWN, e.what());
   } catch (...) {
-    return Status(StatusCode::UNKNOWN, "Exception in method handler");
+    return Status(StatusCode::UNKNOWN, "Unexpected error in RPC handling");
   }
 #else   // GRPC_ALLOW_EXCEPTIONS
   return handler();

test/cpp/end2end/exception_test.cc

@@ -105,7 +105,6 @@ TEST_F(ExceptionTest, RequestStream) {
 
   EXPECT_FALSE(s.ok());
   EXPECT_EQ(s.error_code(), StatusCode::UNKNOWN);
-  EXPECT_EQ(s.error_message(), kErrorMessage);
 }
 
 #endif  // GRPC_ALLOW_EXCEPTIONS