Handle case where engine.json missing or corrupt (#7049)

Signed-off-by: Alex Peterson <26804013+AMZN-alexpete@users.noreply.github.com>

Code/Tools/ProjectManager/Source/Application.cpp

@@ -196,9 +196,7 @@ namespace O3DE::ProjectManager
             return true;
         }
 
-        bool forceRegistration = false;
-
-        // check if an engine with this name is already registered
+        // check if an engine with this name is already registered and has a valid engine.json
         auto existingEngineResult = m_pythonBindings->GetEngineInfo(engineInfo.m_name);
         if (existingEngineResult)
         {
@@ -230,10 +228,11 @@ namespace O3DE::ProjectManager
                 // user elected not to change the name or force registration
                 return false;
             }
-
-            forceRegistration = true;
         }
 
+        // always force register in case there is an engine registered in o3de_manifest.json, but
+        // the engine.json is missing or corrupt in which case GetEngineInfo() fails
+        constexpr bool forceRegistration = true;
         auto registerOutcome = m_pythonBindings->SetEngineInfo(engineInfo, forceRegistration);
         if (!registerOutcome)
         {