AutoTest: Do not connect on nullptr object

The application can be a nullptr. If so, do not try to
establish a connection.

Change-Id: Icdcd04a016105f163691144277f44c65f96d3847
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/gtest/gtestoutputreader.cpp

@@ -48,6 +48,7 @@ GTestOutputReader::GTestOutputReader(const QFutureInterface<TestResultPtr> &futu
     , m_executable(testApplication ? testApplication->program() : QString())
     , m_projectFile(projectFile)
 {
+    if (m_testApplication) {
         connect(m_testApplication,
                 static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished),
                 this, [this] (int exitCode, QProcess::ExitStatus /*exitStatus*/) {
@@ -60,6 +61,7 @@ GTestOutputReader::GTestOutputReader(const QFutureInterface<TestResultPtr> &futu
                 reportCrash();
         });
     }
+}
 
 void GTestOutputReader::processOutput(const QByteArray &outputLine)
 {