Stop the value command on the untrusted-safe allowlist crashing the daemon

glibc leaves endptr unset for a small invalid base; ERANGE throws instead of clamping.

test/src/test_command_dynamic.h

@@ -8,6 +8,7 @@ class TestCommandDynamic : public test_fixture {
   CPPUNIT_TEST(test_get_set);
   CPPUNIT_TEST(test_old_style);
   CPPUNIT_TEST(test_insert_list);
+  CPPUNIT_TEST(test_value_base);
 
   CPPUNIT_TEST_SUITE_END();
 
@@ -20,6 +21,7 @@ public:
 
   void test_old_style();
   void test_insert_list();
+  void test_value_base();
 
 private:
   std::unique_ptr<TestMainThread> m_test_main_thread;