Add table change checks and cell initialization in Erase

Ensure the Erase shard handles table modifications by checking if the table has changed and initializing the variable cell when required.

shards/modules/core/core.cpp

@@ -1319,6 +1319,13 @@ struct Erase : SeqUser {
   }
 
   SHVar activate(SHContext *context, const SHVar &input) {
+    if (unlikely(_isTable)) {
+      checkIfTableChanged();
+      if (unlikely(_cell == nullptr)) {
+        fillVariableCell();
+      }
+    }
+
     const auto &indices = _indices.get();
     if (_cell->valueType == SHType::Table) {
       if (indices.valueType != SHType::Seq) {