Allow assert in global scope

Author: Thirumalai-Shaktivel

src/lpython/semantics/python_ast_to_asr.cpp

@@ -3800,6 +3800,10 @@ class SymbolTableVisitor : public CommonVisitor<SymbolTableVisitor> {
     void visit_For(const AST::For_t &/*x*/) {
         // We skip this in the SymbolTable visitor, but visit it in the BodyVisitor
     }
+
+    void visit_Assert(const AST::Assert_t &/*x*/) {
+        // We skip this in the SymbolTable visitor, but visit it in the BodyVisitor
+    }
 };
 
 Result<ASR::asr_t*> symbol_table_visitor(Allocator &al, LocationManager &lm, const AST::Module_t &ast,