updated demo for new data location (and works if no caption annotations)

Author: pdollar

MatlabAPI/cocoDemo.m

@@ -1,7 +1,7 @@
 %% Demo for the CocoApi (see CocoApi.m)
 
 %% initialize COCO api for instance annotations
-dataDir='.'; dataType='val2014';
+dataDir='../'; dataType='val2014';
 annFile=sprintf('%s/annotations/instances_%s.json',dataDir,dataType);
 if(~exist('coco','var')), coco=CocoApi(annFile); end
 
@@ -28,6 +28,7 @@
 
 %% initialize COCO api for caption annotations
 annFile=sprintf('%s/annotations/captions_%s.json',dataDir,dataType);
+if(~exist(annFile,'file')), return; end
 if(~exist('caps','var')), caps=CocoApi(annFile); end
 
 %% load and display caption annotations