fix: validate aims param early in plot_aim_heatmap for clearer error (malariagen#290)

Author: Tanisha127

malariagen_data/anoph/aim_data.py

@@ -208,6 +208,7 @@ def plot_aim_heatmap(
         show: plotly_params.show = True,
         renderer: plotly_params.renderer = None,
     ) -> plotly_params.figure:
+        aims = self._prep_aims_param(aims=aims)
         # Load AIM calls.
         ds = self.aim_calls(
             aims=aims,