slapos_cloud: make getSoftwareInstallationFromUrl public and remove except NotFound

* NotFound Errors are now handled by API

master/bt5/slapos_cloud/MixinTemplateItem/portal_components/mixin.erp5.SlapOSComputeNodeMixin.py

@@ -307,12 +307,6 @@ class SlapOSComputeNodeMixin(object):
     return partition_dict
 
   def getSoftwareInstallationFromUrl(self, url):
-    try:
-      return self._getSoftwareInstallationFromUrl(url)
-    except NotFound:
-      return None
-
-  def _getSoftwareInstallationFromUrl(self, url):
     software_installation_list = self.getPortalObject().portal_catalog.unrestrictedSearchResults(
       portal_type='Software Installation',
       default_aggregate_uid=self.getUid(),