Fix a...strange debug issue.

Didn't get this to happen on release testing.

src/UnlockManager.cpp

@@ -565,6 +565,8 @@ void UnlockManager::Load()
 	// Make sure that we don't have duplicate unlock IDs. This can cause problems
 	// with UnlockCelebrate and with codes.
 	unsigned size = m_UnlockEntries.size();
+	if (size > 1)
+	{
 		for (unsigned i = 0; i < size - 1; ++i)
 		{
 			UnlockEntry const &ue1 = m_UnlockEntries[i];
@@ -576,6 +578,7 @@ void UnlockManager::Load()
 			
 			}
 		}
+	}
 
 	for (UnlockEntry &e : m_UnlockEntries)
 	{