Loggin chart and other media logs exception but fails silently without context

[polyaxon-team]

Describe the bug

For example logging the following chart :

import plotly.express as px

from polyaxon import tracking

tracking.init(project="demo", is_new=True, tags=["examples"])

df = px.data.tips()
fig = px.density_heatmap(df, x="total_bill", y="tip", facet_row="sex", facet_col="smoker")
tracking.log_plotly_chart(name="2d-hist", figure=fig)

Would work if both plotly and matplotlib are installed, but if matplotlib is not installed it will raise the following error:

plotly is required for this tracking operation!
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "~/.virtualenvs/plx/lib/python3.9/site-packages/traceml/serialization/writer.py", line 124, in close
    self._event_writer.flush()
  File "~/.virtualenvs/plx/lib/python3.9/site-packages/traceml/serialization/base.py", line 82, in flush
    self._append_events(events_spec)
  File "~/.virtualenvs/plx/lib/python3.9/site-packages/traceml/serialization/base.py", line 58, in _append_events
    event_file.write(events_spec.get_csv_events())
  File "~/.virtualenvs/plx/lib/python3.9/site-packages/traceml/events/schemas.py", line 553, in get_csv_events
    events = ["\n{}".format(e.to_csv()) for e in self.events]
  File "~/.virtualenvs/plx/lib/python3.9/site-packages/traceml/events/schemas.py", line 553, in <listcomp>
    events = ["\n{}".format(e.to_csv()) for e in self.events]
  File "~/.virtualenvs/plx/lib/python3.9/site-packages/traceml/events/schemas.py", line 449, in to_csv
    self.get_value(dump=True),
  File "~/.virtualenvs/plx/lib/python3.9/site-packages/traceml/events/schemas.py", line 433, in get_value
    return self.chart.to_dict(dump=dump) if dump else self.chart
AttributeError: 'str' object has no attribute 'to_dict'

Expected behavior

The tracking module should raise more informative error, also the tracking module should return an error that can be processed correctly, currently it returns the following error code