adjust property generation to not panic by always having some property to select from

simulator/runner/env.rs

@@ -320,6 +320,10 @@ impl SimulatorEnv {
         if let Some(min_tick) = cli_opts.min_tick {
             profile.io.latency.min_tick = min_tick;
         }
+        if cli_opts.differential {
+            // Disable faults when running against sqlite as we cannot control faults on it
+            profile.io.enable = false;
+        }
 
         profile.validate().unwrap();