fix: Handle hypervisor_id option properly

* Card ID: CCT-2241
* When hypervisor_id is set to hostname and Nutanix does not
  provide `name` property in host object, then fallback to
  uuid for hypervisor_id

Signed-off-by: Jiri Hnidek <jhnidek@redhat.com>

Author: jirihnidek

virtwho/virt/ahv/ahv.py

@@ -104,7 +104,6 @@ def get_host_guest_mapping_v3(self):
             Dictionary with host-guest mapping
         """
         mapping = {'hypervisors': []}
-        hypervisor_id = None
 
         host_uvm_map = self._interface.build_host_to_uvm_map()
 
@@ -113,15 +112,18 @@ def get_host_guest_mapping_v3(self):
         for host_uuid in host_uvm_map:
             host = host_uvm_map[host_uuid]
 
-            try:
-                if self.config['hypervisor_id'] == 'uuid':
-                    hypervisor_id = host_uuid
-                elif self.config['hypervisor_id'] == 'hostname':
+            # Set hypervisor_id to default uuid. The self.config['hypervisor_id']
+            # can have only two possible values: 'uuid' or 'hostname' at this point.
+            hypervisor_id = host_uuid
+            if self.config['hypervisor_id'] == 'uuid':
+                self.logger.debug("Using hypervisor_id: uuid: %s", hypervisor_id)
+            elif self.config['hypervisor_id'] == 'hostname':
+                try:
                     hypervisor_id = host['name']
-
-            except KeyError:
-                self.logger.debug("Host '%s' doesn't have hypervisor_id property", host_uuid)
-                continue
+                    self.logger.debug("Using hypervisor_id: hostname: %s", hypervisor_id)
+                except KeyError:
+                    self.logger.warning("Host '%s' doesn't have 'name' property", host_uuid)
+                    self.logger.warning("Falling back to default hypervisor_id: uuid")
 
             guests = []
             if 'guest_list' in host and len(host['guest_list']) > 0: