error msg for using smoothquant without calibration dataset (#1526)

SUMMARY:
check for calibration dataset not present 
#1510

---------

Co-authored-by: Kyle Sayers <kylesayrs@gmail.com>
Co-authored-by: Dipika Sikka <dipikasikka1@gmail.com>

Author: 3 people

src/llmcompressor/modifiers/smoothquant/base.py

@@ -127,6 +127,14 @@ def on_initialize(self, state: State, **kwargs) -> bool:
                 f"Expected start to be None or -1, got {self.end}"
             )
 
+        if (
+            not hasattr(state, 'data') or
+            state.data.calib is None
+        ):
+            raise ValueError(
+                f"{self.__class__.__name__} requires a calibration dataset to be "
+                "provided"
+            )
         self.ignore = [] if not self.ignore else self.ignore
         self.mappings = self._infer_mappings_from_model(state.model)
         self.resolved_mappings_ = self._resolve_mappings(state.model)