Apply 'readability-container-size-empty' fix-it

Change-Id: I4693b9a2c941b63e8b60bbe5d188031e648354f6
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/protobuf/cpp/main.cpp b/examples/protobuf/cpp/main.cpp
index 703a9d302..8d2ca9763 100644
--- a/examples/protobuf/cpp/main.cpp
+++ b/examples/protobuf/cpp/main.cpp
@@ -96,7 +96,7 @@ void listPeople(const tutorial::AddressBook& address_book)
 
         std::cout << "Person ID: " << person.id() << std::endl;
         std::cout << "  Name: " << person.name() << std::endl;
-        if (person.email() != "") {
+        if (!person.email().empty()) {
             std::cout << "  E-mail address: " << person.email() << std::endl;
         }