Handle closed standard input gracefully

For: #26

Author: ben-grande

usr/lib/python3/dist-packages/stdisplay/stcat.py

@@ -15,7 +15,7 @@
 def main() -> None:
     """Safely print stdin or file to stdout."""
     # https://github.com/pytest-dev/pytest/issues/4843
-    if "pytest" not in modules:
+    if "pytest" not in modules and stdin is not None:
         stdin.reconfigure(errors="ignore")  # type: ignore
     ## File input reads stdin when no file is provided or file is '-'.
     for untrusted_text in file_input(encoding="ascii", errors="replace"):

usr/lib/python3/dist-packages/stdisplay/stcatn.py

@@ -20,7 +20,7 @@ def main() -> None:
     main
     """
     # https://github.com/pytest-dev/pytest/issues/4843
-    if "pytest" not in modules:
+    if "pytest" not in modules and stdin is not None:
         stdin.reconfigure(errors="ignore")  # type: ignore
 
     for line in file_input(encoding="ascii", errors="replace"):

usr/lib/python3/dist-packages/stdisplay/stsponge.py

@@ -16,7 +16,7 @@
 def main() -> None:
     """Safely print stdin to stdout or file."""
     # https://github.com/pytest-dev/pytest/issues/4843
-    if "pytest" not in modules:
+    if "pytest" not in modules and stdin is not None:
         stdin.reconfigure(errors="ignore")  # type: ignore
     untrusted_text_list = []
     for untrusted_text in stdin:

usr/lib/python3/dist-packages/stdisplay/sttee.py

@@ -13,7 +13,7 @@
 def main() -> None:
     """Safely print stdin to stdout and file."""
     # https://github.com/pytest-dev/pytest/issues/4843
-    if "pytest" not in modules:
+    if "pytest" not in modules and stdin is not None:
         stdin.reconfigure(errors="ignore")  # type: ignore
     untrusted_text_list = []
     for untrusted_text in stdin: