forgot an else

src/sage/databases/findstat.py

@@ -458,6 +458,15 @@ def __call__(self, query, function=None, depth=2, max_values=FINDSTAT_MAX_VALUES
             Traceback (most recent call last):
             ...
             ValueError: The given arguments, Permutations and 1, cannot be used for a FindStat search.
+
+            sage: from sage.databases.findstat import FindStatCollection
+            sage: findstat(FindStatCollection("Permutations"), lambda pi: pi.length())    # optional -- internet,random
+            0: (St000018: The [[/Permutations/Inversions|number of inversions]] of a permutation., [], 200)
+            1: (St000004: The [[/Permutations/Descents-Major|major index]] of a permutation., [Mp00062: inversion-number to major-index bijection], 200)
+            2: (St000067: The inversion number of the alternating sign matrix., [Mp00063: to alternating sign matrix], 152)
+            3: (St000246: The [[/Permutations/Inversions|number of non-inversions]] of a permutation., [Mp00064: reverse], 200)
+            4: (St000008: The major index of the composition., [Mp00062: inversion-number to major-index bijection, Mp00071: descent composition], 200)
+
         """
         try:
             depth = int(depth)
@@ -526,7 +535,9 @@ def __call__(self, query, function=None, depth=2, max_values=FINDSTAT_MAX_VALUES
 
         else:
             if callable(function):
-                if not isinstance(query, FindStatCollection):
+                if isinstance(query, FindStatCollection):
+                    collection = query
+                else:
                     collection = FindStatCollection(query)
                 first_terms = collection.first_terms(function, max_values=max_values)
                 data = [([key], [value]) for (key, value) in first_terms]