Don't error out if the file isn't found.

main.py

@@ -11,12 +11,17 @@ def no_credential():
 
 lp = Launchpad.login_with('Mass package bug subscription adder', 'production', credential_save_failed=no_credential)
 teamtowrite = (input('What person/team would you like to use for this? (Launchpad ID) '))
-filepath = (input('Please specify the path of the input file: '))
 
-with open(filepath, "r") as ins:
-    filearray = []
-    for line in ins:
-        filearray.append(line.strip())
+while True:
+    try:
+        filepath = (input('Please specify the path of the input file: '))
+        with open(filepath, "r") as ins:
+            filearray = []
+            for line in ins:
+                filearray.append(line.strip())
+        break
+    except FileNotFoundError:
+        print("File not found.")
 
 for i in range(len(filearray)):
     print("Assigning:")