Remove checks for invalid multi-value separators

Now that I no longer treat the fix for these as "unsafe" I don't a
ctually need to check for them—I can just fix them when I see them.

csv_metadata_quality/app.py

@@ -104,9 +104,6 @@ def run(argv):
         # Fix: unnecessary Unicode
         df[column] = df[column].apply(fix.unnecessary_unicode)
 
-        # Check: invalid and unnecessary multi-value separators
-        df[column] = df[column].apply(check.separators, field_name=column)
-
         # Check: suspicious characters
         df[column] = df[column].apply(check.suspicious_characters, field_name=column)
 

csv_metadata_quality/check.py

@@ -58,42 +58,6 @@ def isbn(field):
     return field
 
 
-def separators(field, field_name):
-    """Check for invalid and unnecessary multi-value separators, for example:
-
-        value|value
-        value|||value
-        value||value||
-
-    Prints the field with the invalid multi-value separator.
-    """
-
-    # Skip fields with missing values
-    if pd.isna(field):
-        return
-
-    # Try to split multi-value field on "||" separator
-    for value in field.split("||"):
-        # Check if the current value is blank
-        if value == "":
-            print(
-                f"{Fore.RED}Unnecessary multi-value separator ({field_name}): {Fore.RESET}{field}"
-            )
-
-            continue
-
-        # After splitting, see if there are any remaining "|" characters
-        match = re.findall(r"^.*?\|.*$", value)
-
-        # Check if there was a match
-        if match:
-            print(
-                f"{Fore.RED}Invalid multi-value separator ({field_name}): {Fore.RESET}{field}"
-            )
-
-    return field
-
-
 def date(field, field_name):
     """Check if a date is valid.