no exception when metrics not found (#22170)

pio-tools/metrics-firmware.py

@@ -6,8 +6,11 @@ from os.path import join
 
 def firm_metrics(source, target, env):
     if env["PIOPLATFORM"] == "espressif32":
+        try:
             import tasmota_metrics
             env.Execute("$PYTHONEXE -m tasmota_metrics \"" + str(tasmotapiolib.get_source_map_path(env).resolve()) + "\"")
+        except:
+            pass
     elif env["PIOPLATFORM"] == "espressif8266":
         map_file = join(env.subst("$BUILD_DIR")) + os.sep + "firmware.map"
         with open(map_file,'r', encoding='utf-8') as f: