fix: possible devision by zero

Author: GrKoR

water_unit_common.yaml

@@ -241,11 +241,18 @@ switch:
           id(pressure_ch3).start_poller();
           id(pressure_ch4).start_poller();
           ESP_LOGW("Pressure", "Enable pressure polling");
-          ESP_LOGW("Pressure", "Calculated average: ch1 = %.3fV, ch2 = %.3fV, ch3 = %.3fV, ch4 = %.3fV",
-                   id(pressure_ch1_zero_point_global) / id(pressure_samples_count_global),
-                   id(pressure_ch2_zero_point_global) / id(pressure_samples_count_global),
-                   id(pressure_ch3_zero_point_global) / id(pressure_samples_count_global),
-                   id(pressure_ch4_zero_point_global) / id(pressure_samples_count_global));
+          if (id(pressure_samples_count_global) == 0)
+          {
+            ESP_LOGW("Pressure", "No pressure samples received!")
+          }
+          else
+          {
+            ESP_LOGW("Pressure", "Calculated average: ch1 = %.3fV, ch2 = %.3fV, ch3 = %.3fV, ch4 = %.3fV",
+                    id(pressure_ch1_zero_point_global) / id(pressure_samples_count_global),
+                    id(pressure_ch2_zero_point_global) / id(pressure_samples_count_global),
+                    id(pressure_ch3_zero_point_global) / id(pressure_samples_count_global),
+                    id(pressure_ch4_zero_point_global) / id(pressure_samples_count_global));
+          }
           id(pressure_ch1_zero_point_global) = 0.0;
           id(pressure_ch2_zero_point_global) = 0.0;
           id(pressure_ch3_zero_point_global) = 0.0;