catch wrapper directory change

Author: bronsolo

plotly/plotly_setup_aux/plotlyupdate.m

@@ -72,6 +72,7 @@ function plotlyupdate(varargin)
 
 % find the location of all plotly/ directories
 dircount = 1; 
+plotlyDirs = {}; 
 for d = 1:length(plotlyScriptDirs)
     %parse filepath string at the Plotly directory
     plotlyLoc = strfind(fileparts(plotlyScriptDirs{d}),fullfile('MATLAB-api-master','plotly'));
@@ -84,6 +85,10 @@ function plotlyupdate(varargin)
     dircount = dircount + 1; 
 end
 
+if isempty(plotlyDirs)
+    error('It seems your plotly wrapper directory structure has changed. Update aborted.'); 
+end
+
 %----update if necessary----%
 if strcmp(pvLocal,pvRemote)
     fprintf(['\nYour Plotly API MATLAB Library v.' pvRemote ' is already up to date! \n\n'])