Fix incorrect logic in issuer_or_subject_length function

The else clause was attached to the 'if common:' statement instead of
checking the total length. This change ensures the TypeError is raised
when no certificate information is provided, regardless of which
parameter is missing.

Fixes #30

Author: akgamerz790

adafruit_atecc/adafruit_atecc_asn1.py

@@ -268,6 +268,7 @@ def issuer_or_subject_length(
         tot_len += 11 + len(org_unit)
     if common:
         tot_len += 11 + len(common)
-    else:
+    
+    if not tot_len:
         raise TypeError("Provided length must be > 0")
     return tot_len