Fix filters for virtual variables

src/lib/components/test_cases/TestCaseFilters.svelte

 <script lang="ts">
-  import { scaleByInstantFromBrackets } from "@openfisca/json-model"
+  import {
+    scaleByInstantFromBrackets,
+    type Variable,
+  } from "@openfisca/json-model"
   import { createEventDispatcher, getContext } from "svelte"
   import type { Writable } from "svelte/store"
 
@@ -179,6 +182,7 @@
     filterValueByName,
     showOnlyDeciles,
     filterNiveauDeVieValue,
+    variableSummary,
   )
 
   $: filterValueByName = Object.fromEntries(
@@ -222,6 +226,7 @@
     },
     showOnlyDeciles: boolean,
     filterNiveauDeVie: string | undefined,
+    variableSummary: Variable | undefined,
   ): [Situation, number][] {
     const filtered: [Situation, number][] = []
     for (const [index, situation] of testCases.entries()) {
@@ -377,7 +382,7 @@
             }
           }
         }
-        if (filterValueByName["dispositif"]) {
+        if (filterValueByName["dispositif"] && variableSummary !== undefined) {
           const latestCalculationValue = getLatestCalculation(
             $evaluationByNameArray[index][variableName]
               ?.calculationEvaluationByName,
@@ -423,7 +428,7 @@
 
 <div class="mt-2 flex flex-wrap gap-2">
   {#each filters as filter}
-    {#if filter.name !== "dispositif" || shortLabel}
+    {#if filter.name !== "dispositif" || variableSummary !== undefined}
       <button
         class="relative flex items-center gap-1 px-3 py-1 rounded-full overflow-hidden transition after:absolute after:inset-0 after:rounded-full after:transition hover:after:bg-black/5 active:after:bg-black/10"
         class:bg-gray-200={filter.value === false}