Strip the CSR from event for correct comparison (#52)

* Strip csr from event for correct comparison

* Lint

* Bump LIBPATCH

Author: sed-i

lib/charms/observability_libs/v0/cert_handler.py

@@ -62,7 +62,7 @@
 
 LIBID = "b5cd5cd580f3428fa5f59a8876dcbe6a"
 LIBAPI = 0
-LIBPATCH = 2
+LIBPATCH = 3
 
 
 class CertChanged(EventBase):
@@ -257,7 +257,12 @@ def _on_certificate_available(self, event: CertificateAvailableEvent) -> None:
         # relation-changed. If that is not the case, we would need more guards and more paths.
 
         # Process the cert only if it belongs to the unit that requested it (this unit)
-        if event.certificate_signing_request == self._csr:
+        event_csr = (
+            event.certificate_signing_request.strip()
+            if event.certificate_signing_request
+            else None
+        )
+        if event_csr == self._csr:
             self._ca_cert = event.ca
             self._server_cert = event.certificate
             self._chain = event.chain