Fix empty timestamp for dashboard

Signed-off-by: Ruofei Zou <[email protected]>

common/amundsen_common/models/dashboard.py

@@ -4,9 +4,27 @@
 from typing import List, Optional
 
 import attr
+from marshmallow import fields
 from marshmallow3_annotations.ext.attrs import AttrsSchema
 
 
+class SafeFloat(fields.Field):
+    def _serialize(self, value, attr, obj, **kwargs):
+        if value == '':
+            return None
+        try:
+            return float(value)
+        except ValueError:
+            self.fail('invalid', input=value)
+
+    def _deserialize(self, value, attr, data, **kwargs):
+        if value == '':
+            return None
+        try:
+            return float(value)
+        except ValueError:
+            self.fail('invalid', input=value)
+
 @attr.s(auto_attribs=True, kw_only=True)
 class DashboardSummary:
     uri: str = attr.ib()
@@ -25,3 +43,5 @@ class DashboardSummarySchema(AttrsSchema):
     class Meta:
         target = DashboardSummary
         register_as_scheme = True
+
+    last_successful_run_timestamp = SafeFloat()

common/setup.py

@@ -4,7 +4,7 @@
 
 from setuptools import find_packages, setup
 
-__version__ = '0.32.0'
+__version__ = '0.33.0'
 
 
 requirements_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'requirements-dev.txt')