Make Anys in SeqInfo into Optional[str] + fix treat_age for None

apparently treat_age would have made None into "None" string which maybe_na would
not map to n/a.  So decided to make it more explicit and specific here.
I checked on sample that we do get even time as  "str" from dcmdata, so
should be matching

heudiconv/bids.py

@@ -103,8 +103,10 @@ def maybe_na(val: Any) -> str:
         return "n/a"
 
 
-def treat_age(age: str|float) -> str:
+def treat_age(age: str|float|None) -> str|None:
     """Age might encounter 'Y' suffix or be a float"""
+    if age is None:
+        return None  # might be converted to N/A by maybe_na
     agestr = str(age)
     if agestr.endswith("M"):
         agestr = agestr.rstrip("M")
@@ -367,7 +369,7 @@ def tuneup_bids_json_files(json_files: list[str]) -> None:
                 set_readonly(json_phasediffname)
 
 
-def add_participant_record(studydir: str, subject: str, age: str, sex: str) -> None:
+def add_participant_record(studydir: str, subject: str, age: str|None, sex: str|None) -> None:
     participants_tsv = op.join(studydir, "participants.tsv")
     participant_id = "sub-%s" % subject
 

heudiconv/tests/test_bids.py

@@ -66,6 +66,7 @@ def test_maybe_na() -> None:
 
 
 def test_treat_age() -> None:
+    assert treat_age(None) == None
     assert treat_age(0) == "0"
     assert treat_age("0") == "0"
     assert treat_age("0000") == "0"

heudiconv/utils.py

@@ -57,18 +57,18 @@ class SeqInfo(NamedTuple):
     protocol_name: str  # 12
     is_motion_corrected: bool  # 13
     is_derived: bool  # 14
-    patient_id: Any  # 15
+    patient_id: Optional[str]  # 15
     study_description: str  # 16
     referring_physician_name: str  # 17
     series_description: str  # 18
     sequence_name: str  # 19
     image_type: tuple[str, ...]  # 20
     accession_number: str  # 21
-    patient_age: Any  # 22
-    patient_sex: Any  # 23
-    date: Any  # 24
-    series_uid: Any  # 25
-    time: Any  # 26
+    patient_age: Optional[str]  # 22
+    patient_sex: Optional[str]  # 23
+    date: Optional[str]  # 24
+    series_uid: Optional[str]  # 25
+    time: Optional[str]  # 26
 
 
 class StudySessionInfo(NamedTuple):
@@ -356,7 +356,7 @@ def treat_infofile(filename: str) -> None:
     set_readonly(filename)
 
 
-def slim_down_info(j: Any) -> Any:
+def slim_down_info(j: dict[str, Any]) -> dict[str, Any]:
     """Given an aggregated info structure, removes excessive details
 
     Such as CSA fields, and SourceImageSequence which on Siemens files could be