Github user TimBarham commented on a diff in the pull request:

    https://github.com/apache/cordova-lib/pull/223#discussion_r30817164
  
    --- Diff: cordova-lib/src/cordova/platform.js ---
    @@ -122,6 +122,12 @@ function addHelper(cmd, hooksRunner, projectRoot, 
targets, opts) {
                             if (platformAlreadyAdded) {
                                 throw new CordovaError('Platform ' + platform 
+ ' already added.');
                             }
    +
    +                        // Remove the <platform>.json file from the 
plugins directory, so we start clean (otherwise we
    +                        // can get into trouble not installing plugins if 
someone deletes the platform folder but
    +                        // <platform>.json still exists).
    +                        removePlatformPluginsJson(projectRoot, target);
    --- End diff --
    
    Regarding your first point: If you look at the context of where the call 
was added, it is within an `if (cmd == 'add')` check.
    
    Regarding your second point - no, we still want the file deleted even if 
the `add` operation fails. Essentially we're just putting things into the state 
they would have been in if the platform had been properly removed, so we want 
to get into that state as early as possible.


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