get_conda_bin fix

[PrajwalPrashanth]

Reported Issue https://jovian.ml/forum/t/jovian-commit-not-working/7367

        conda_exe = os.environ.get("CONDA_EXE")
        # Check if it returns a valid path
        if conda_exe != '' and conda_exe != '$CONDA_EXE':

Previous check was for empty string where as conda_exe would be None if it did not find a valid path

[codecov[bot]]

Codecov Report

Merging #199 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #199   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines         1356      1356           
=========================================
  Hits          1356      1356           

Flag	Coverage Δ
#unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
jovian/utils/environment.py	100.00% <100.00%> (ø)

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