safe access for AlphaVersion (#797)

Signed-off-by: ltimothy7 <66969084+ltimothy7@users.noreply.github.com>

Author: ltimothy7

pyvcloud/vcd/client.py

@@ -42,6 +42,7 @@
 
 SIZE_1MB = 1024 * 1024
 SYSTEM_ORG_NAME = 'system'
+ALPHA_API_SUBSTRING = "alpha"
 
 NSMAP = {
  'ns10':
@@ -955,11 +956,17 @@ def get_supported_versions_list(self, include_alpha_versions: bool = False): #
  if not hasattr(version, 'deprecated') or \
  version.get('deprecated').lower() == 'false':
  active_versions.append(str(version.Version.text))
- if include_alpha_versions:
+ if include_alpha_versions and hasattr(versions, "AlphaVersion"):
  for version in versions.AlphaVersion:
  if not hasattr(version, 'deprecated') or \
  version.get('deprecated') == 'false':
- active_versions.append(str(version.Version.text))
+ # alpha version may be of the form `3X.0.0-alpha-12345`
+ # so we remove the portion after "alpha"
+ alpha_version = str(version.Version.text)
+ start_alpha_ind = alpha_version.find(ALPHA_API_SUBSTRING) # noqa: E501
+ if start_alpha_ind != -1:
+ alpha_version = alpha_version[:start_alpha_ind + len(ALPHA_API_SUBSTRING)] # noqa: E501
+ active_versions.append(alpha_version)
  active_versions.sort(key=VCDApiVersion)
  return active_versions