no file update

app.py

@@ -7,7 +7,7 @@ import signal
 import sys
 from asyncio import AbstractEventLoop
 from concurrent.futures import ThreadPoolExecutor
-from typing import Any
+from typing import Any, Optional
 
 from absl import app, flags
 from marshmallow import EXCLUDE
@@ -44,16 +44,20 @@ class CSVLogger(PacketLogger):
 
     BREAK_LINE = "\r\n"
 
-    def __init__(self, file_path: str):
+    def __init__(self, file_path: Optional[str] = None):
         self.file_path = file_path
-        is_file_exists = os.path.exists(self.file_path)
-        self.file = open(self.file_path, "a+")
-        if not is_file_exists:
-            self.write("; ".join(["Station ID", "Timestamp", "Frequency",
-                                  "DoA", "Confidence", "Power", "Serial",
-                                  "Radio Bearing",
-                                  "Compass Offset"]) + self.BREAK_LINE)
-            self.save()
+        self.file = None
+
+        if file_path is not None:
+            self.file_path = file_path
+            is_file_exists = os.path.exists(self.file_path)
+            self.file = open(self.file_path, "a+")
+            if not is_file_exists:
+                self.write("; ".join(["Station ID", "Timestamp", "Frequency",
+                                      "DoA", "Confidence", "Power", "Serial",
+                                      "Radio Bearing",
+                                      "Compass Offset"]) + self.BREAK_LINE)
+                self.save()
 
     @staticmethod
     def serialize_data(data: Any) -> str:
@@ -65,6 +69,9 @@ class CSVLogger(PacketLogger):
     # noinspection PyBroadException
     def write(self, data: str) -> None:
         """ Try write """
+        if self.file is None:
+            return
+
         while True:
             try:
                 self.file.write(data)
@@ -88,8 +95,9 @@ class CSVLogger(PacketLogger):
 
     def save(self) -> None:
         """ Save data """
-        self.file.flush()
-        self.file.close()
+        if self.file is not None:
+            self.file.flush()
+            self.file.close()
 
 
 def init_logging(filename: str = None, level: int = None) -> None: