fix: replace 3 bare except clauses with except Exception (#3980)

Co-authored-by: petyaslavova <petya.slavova@redis.com>

Author: haosenwang1018

doctests/query_em.py

@@ -45,15 +45,15 @@
     print(res.total)
     # >>> 1
     assert res.total == 1
-except:
+except Exception:
     print("'@price:[270]' syntax not yet supported.")
 
 try:
     res = index.search(Query("@price==270")) # not yet supported in redis-py
     print(res.total)
     # >>> 1
     assert res.total == 1
-except:
+except Exception:
     print("'@price==270' syntax not yet supported.")
 
 query = Query("*").add_filter(NumericFilter("price", 270, 270))
@@ -89,7 +89,7 @@
 try:
     res = idx_email.search(Query("test@redis.com").dialect(2))
     print(res)
-except:
+except Exception:
     print("'test@redis.com' syntax not yet supported.")
 # REMOVE_START
 r.ft("idx:email").dropindex(delete_documents=True)