[lldb][testsuite] Check that process is launched successfully in inline tests

lldb/packages/Python/lldbsuite/test/lldbinline.py

@@ -137,6 +137,8 @@ class InlineTest(TestBase):
         parser.set_breakpoints(target)
 
         process = target.LaunchSimple(None, None, self.get_process_working_directory())
+        self.assertIsNotNone(process, PROCESS_IS_VALID)
+
         hit_breakpoints = 0
 
         while lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint):