Check for mutations and clades before removing #264
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Description of proposed changes
Fixes a bug in the fix_tree script when trying to remove mutations or clades from lists where those values don't exist. The short-term fix is to check for the presence of the values in the lists before trying to remove them. The long term fix is to use a different tree builder than eliminates the need for a "fix tree" script.
Related issue(s)
Checklist