Catch exception in resource cleaner write function and log error

src/wpsremote/resource_cleaner.py

@@ -185,6 +185,8 @@ def read_from_file(self, filepath):
             self._spawned_process_cmd = json.loads(self._spawned_process_cmd)
 
     def write(self):
+        logger = logging.getLogger("Resource.write")
+
         if self.filepath().exists():
             self.filepath().remove()
 
@@ -214,9 +216,13 @@ def write(self):
         else:
             config.set("DEFAULT", "spawned_process_cmd", "" ) 
 
-        fp = self.filepath().open('wb') #todo: use file lock
-        config.write(fp)
-        fp.close()
+        try:
+            fp = self.filepath().open('wb') #todo: use file lock
+            config.write(fp)
+            fp.close()
+        except Exception as ex:
+            logger.error("could not create file '"+self.filepath()+"' due to: " + str(ex))
+            raise ex("could not create file '"+self.filepath()+"'")
 
     def kill_spawned_process(self):
         """kill all spawned process generated by processbot"""