PZEM-004T - detect electrysyty failure

### The problem

If there is no power to the high-voltage part of the PZEM-004T, it does not output anything, but the platform has processed that if there is nothing, the values do not change. Electrysyty failure cannot be tracked.
I suggest making the following changes to pzemac.cpp:

void PZEMAC::on_modbus_data(const std::vector &data) {
if (data.size() < 20) {
ESP_LOGW(TAG, "Invalid size for PZEM AC!");
// start add
this->voltage_sensor_->publish_state(0);
this->current_sensor_->publish_state(0);
this->power_sensor_->publish_state(0);
this->frequency_sensor_->publish_state(0);
this->power_factor_sensor_->publish_state(0);
//stop add
return;
}
...
Anern Grid Voltage - Hybrid Solar Inverter
Energy Monitoring External Voltage - PZEM004T

### Which version of ESPHome has the issue?

2023.12.7

### What type of installation are you using?

Home Assistant Add-on

### Which version of Home Assistant has the issue?

2024.1.3

### What platform are you using?

ESP8266

### Board

d1_mini

### Component causing the issue

PZEM-004T v3

### Example YAML snippet

_No response_

### Anything in the logs that might be useful for us?

_No response_

### Additional information

_No response_