Move safe_getattr from CLI to SDK

Author: philogicae

src/aleph/sdk/utils.py

@@ -393,3 +393,11 @@ def make_packet_header(
     header[20:52] = h.digest()
 
     return header
+
+
+def safe_getattr(obj, attr, default=None):
+    for part in attr.split("."):
+        obj = getattr(obj, part, default)
+        if obj is default:
+            break
+    return obj