feat(code): Warn if findings studies do not match available

Since we add the studies that bring findings for the finding tables manually,
this ensures that we spot any mistakes when entering them, or similar
discrepancies on the other side of the raw data.

src/model/validity.py

@@ -19,9 +19,15 @@ def _combined_validities(
         return
     combined = 0.0
     for study in apply_to.split(";"):
+        if study not in by_intervention["citation"].unique():
+            print(
+                f"WARNING: Findings table {study} study did not match any study in interventions dataframe!"
+            )
         new = by_intervention.loc[by_intervention["citation"] == study, column]
-        if len(new) > 0 and not math.isnan(new.iat[0]):
-            combined += new.iat[0]
+        if len(new) == 0 or math.isnan(new.iat[0]):
+            continue
+        combined += new.iat[0]
+
     if combined:
         return _binned_strength(combined)
     return r"\-"