Flow Run fails when base_image="python:3.7" and prefect_version="0.7.0" are set

[nanseay]

Description

'RemoteEnvironment' object has no attribute 'on_start'
Traceback (most recent call last):
File "/usr/local/bin/prefect", line 8, in
sys.exit(cli())
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 764, in call
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python3.7/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/prefect/cli/execute.py", line 79, in cloud_flow
raise exc
File "/usr/local/lib/python3.7/site-packages/prefect/cli/execute.py", line 71, in cloud_flow
storage=storage, flow_location=storage.flows[flow_data.name]
File "/usr/local/lib/python3.7/site-packages/prefect/environments/execution/remote.py", line 68, in execute
if self.on_start:
AttributeError: 'RemoteEnvironment' object has no attribute 'on_start'

Expected Behavior

My flow to run and complete successfully
(Note: flow ran successfully when run locally)

Reproduction

base_image="python:3.7", prefect_version="0.7.0"

Environment

Core 0.7.0
Python 3.7.3

[joshmeek]

Interesting error because 0.7.0 should have the proper environment callback options. cc @wagoodman wonder if this is somehow related to #1698. Will try to reproduce

[cicdw]

Going to close this as it appears to have been a fluke.