[wasm] Fix CallIndirect with the case of no indirect function table.

src/wasm/wasm-module.h

Index: src/wasm/wasm-module.h
diff --git a/src/wasm/wasm-module.h b/src/wasm/wasm-module.h
index 5e84945da9a6d3828b90e8589a2dff56b1babd57..82c05057e90f46f783a00cacdf96f1a263596d68 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -180,7 +180,8 @@ struct ModuleEnv {
     return module->signatures->at(index);
   }
   size_t FunctionTableSize() {
-    return module ? module->function_table->size() : 0;
+    return module && module->function_table ? module->function_table->size()
+                                            : 0;
   }
 
   Handle<Code> GetFunctionCode(uint32_t index);