Добавил обработку исключений.

IRST_mon.py

@@ -12,10 +12,18 @@ server = '192.168.1.56'
 
 def exec(exe):
     result = subprocess.Popen(exe, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
-    return result.communicate()[0].decode('utf-8')
+    try:
+        ret = result.communicate()[0].decode('utf-8')
+    except Exception:
+        return False
+    else:
+        return ret
 
 
 def discovery(txt):
+    if not txt:
+        print('ERROR')
+        exit(1)
     array = 0
     volume = 0
     data = {'data': []}
@@ -47,6 +55,9 @@ def discovery(txt):
 
 
 def sender(txt):
+    if not txt:
+        print(1)
+        exit(1)
     array = 0
     arraysec = False
     volume = 0
@@ -147,7 +158,13 @@ def sender(txt):
                                                line.split(":")[1].strip()))
 
     zbx = ZabbixSender(server)
-    zbx.send(packet)
+    try:
+        zbx.send(packet)
+    except Exception:
+        print(1)
+    else:
+        print(0)
+
 
 def args():
     if len(sys.argv) > 2: