reporting: @graph: issue warning if no series to plot

matlab/reports/@graph/createGraph.m

@@ -33,6 +33,11 @@ if ~isempty(o.figname)
             o.figname);
 end
 
+if ~o.seriesElements.numElements()
+    warning('@graph.crepateGraph: no series to plot, returning');
+    return;
+end
+
 disp('creating plot..........');
 h = figure('visible','off');
 hold on;

matlab/reports/@graph/write.m

@@ -33,5 +33,8 @@ assert(fid ~= -1);
 if isempty(o.figname)
     o = createGraph(o);
 end
-fprintf(fid, '\\input{%s}', o.figname);
+
+if ~isempty(o.figname)
+    fprintf(fid, '\\input{%s}', o.figname);
+end
 end
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