Replaced all instances of returning None with returning empty values

api/ECNQueue.py

@@ -37,6 +37,8 @@ def __init__(self, queue: str, number: int) -> None:
 		self.userName = self.__getUserName()
 		self.userAlias = self.__getUserAlias()
 		self.assignedTo = self.__getAssignedTo()
+		self.subject = self.__getMostRecentHeaderByType("Subject")["content"]
+		self.status = self.__getMostRecentHeaderByType("Status")["content"]
 
 	def __getLastUpdated(self) -> float:
 		"""Returns last modified time of item reported by the filesystem in mm-dd-yy hh:mm am/pm format.
@@ -160,19 +162,35 @@ def __isLocked(self) -> Union[str, bool]:
 		else:
 			return False
 
-	def __getMostRecentHeaderByType(self, headerType: str) -> Union[dict, None]:
+	def __getMostRecentHeaderByType(self, headerType: str) -> dict:
 		"""Return most recent header of the given type. 
-		If no header of that type exists, returns None.
+		If no header of that type exists, return a header with the type requests and empty content.
+
+		Example: Requesting a Status header that does exist
+			__getMostRecentHeaderByType("Status")
+			becomes 
+			{
+				"type": "Status", 
+				"content": "Waiting for Reply"
+			}
+
+		Example: Requesting a Status header that doesn't exist
+			__getMostRecentHeaderByType("Status")
+			becomes 
+			{
+				"type": "Status", 
+				"content": ""
+			}
 
 		Args:
 			headerType (str): Type of header to return.
 
 		Returns:
-			Union[dict, None]: dict of header if it exists or None
+			dict: dict of header if it exists or dict of requested type with empty content.
 		"""
 		for header in self.headers:
 			if header["type"] == headerType: return header
-		return None
+		return { "type": headerType, "content": "" }
 
 	def __parseFromData(self, data: str) -> str:
 		"""Parse From header and return requested data.
@@ -195,37 +213,38 @@ def __parseFromData(self, data: str) -> str:
 		elif data == "userEmail": return userEmail
 		else: raise ValueError("data='" + str(data) + "' is not a valid option. data must be \"userName\" or \"userEmail\".")
 
-	def __getUserName(self, data="userName") -> Union[str, None]:
+	def __getUserName(self, data="userName") -> str:
 		return self.__parseFromData(data)
 
 	def __getUserEmail(self, data="userEmail") -> str:
 		return self.__parseFromData(data)
 
-	def __getUserAlias(self) -> Union[str, None]:
+	def __getUserAlias(self) -> str:
 		"""Returns user's Career Account alias if present.
-		If Career Account alias isn't present, returns none.
+		If Career Account alias isn't present, returns empty string.
 
 		Example: Email from campb303@purdue.edu
-			userAlias = 'campb303'
+			userAlias = "campb303"
 
 		Example: Email from spam@spammer.net
-			userAlias = None 
+			userAlias = "" 
 
 		Returns:
-			Union[str, None]: User's Career Account alias if present or None
+			str: User's Career Account alias if present or empty string
 		"""
 		emailUser, emailDomain = self.userEmail.split("@")
-		return emailUser if emailDomain.endswith("purdue.edu") else None
+		return emailUser if emailDomain.endswith("purdue.edu") else ""
 
-	def __getAssignedTo(self) -> Union[str, None]:
+	def __getAssignedTo(self) -> str:
 		"""Returns the alias of the person this item was most recently assigned to.
-		Returns None if this item isn't assigned.
+		Returns empty string if this item isn't assigned.
 
 		Returns:
-			Union[str, None]: Alias of the person item is assigned to or None
+			str: Alias of the person item is assigned to or empty string.
 		"""
 		assignedToHeader = self.__getMostRecentHeaderByType("Assigned-To")
-		return assignedToHeader["content"] if assignedToHeader != None else None
+		assignedTo = assignedToHeader["content"]
+		return assignedTo
 
 	def __repr__(self) -> str:
 		return self.queue + str(self.number)