Fix lazy GCS chunk size caching and lineage fallback without gcp deps

Author: RushabhRatnaparkhi

sdks/python/apache_beam/io/gcp/gcsfilesystem.py

@@ -50,19 +50,18 @@ def _get_gcsio(self):
           'GCSFileSystem requires apache-beam[gcp]. '
           'Install it with: pip install apache-beam[gcp]')
 
-  _CHUNK_SIZE = None
-
-  @property
-  def CHUNK_SIZE(self):
-    if self._CHUNK_SIZE is None:
-      self._CHUNK_SIZE = self._get_gcsio().MAX_BATCH_OPERATION_SIZE
-    return self._CHUNK_SIZE  # Chuck size in batch operations
-
   GCS_PREFIX = 'gs://'
 
   def __init__(self, pipeline_options):
     super().__init__(pipeline_options)
     self._pipeline_options = pipeline_options
+    self._chunk_size = None
+
+  @property
+  def CHUNK_SIZE(self):
+    if self._chunk_size is None:
+      self._chunk_size = self._get_gcsio().MAX_BATCH_OPERATION_SIZE
+    return self._chunk_size
 
   @classmethod
   def scheme(cls):
@@ -387,7 +386,7 @@ def report_lineage(self, path, lineage):
     try:
       gcsio = self._get_gcsio()
       components = gcsio.parse_gcs_path(path, object_optional=True)
-    except ValueError:
+    except (ImportError, ValueError):
       # report lineage is fail-safe
       traceback.print_exc()
       return