checker: Don't canonise too eagerly

lib/checker.py

@@ -79,6 +79,7 @@ def check_task(automaton: Union[reg.DFA, reg.NFA], task: str) -> str:
     if task == "MIN" and not automaton.is_minimal():
         output = "DFA není minimální."
 
+    if task in {"CAN", "TOC", "MIC"}:
         canonical = automaton.is_canonical()
         if task == "CAN" and not canonical:
             output = "DFA není kanonický."