fix: setting null icons

CHANGELOG.md

@@ -7,6 +7,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [0.4.3]
 ### Improvements
 - new environment variable / argument to enable / disable the tray icon and update-check daemon: FPAKMAN_TRAY (--tray)
+### Fixes:
+- replacing default app icons by null icons
 
 ## [0.4.2] - 2019-07-28
 ### Improvements

fpakman/view/qt/apps_table.py

@@ -179,9 +179,14 @@ class AppsTable(QTableWidget):
         icon_was_cached = True
 
         if not icon_data:
+            icon_bytes = http_response.readAll()
+
+            if not icon_bytes:
+                return
+
             icon_was_cached = False
             pixmap = QPixmap()
-            icon_bytes = http_response.readAll()
+
             pixmap.loadFromData(icon_bytes)
             icon = QIcon(pixmap)
             icon_data = {'icon': icon, 'bytes': icon_bytes}