save 0x0 solid real empty array to null

git-svn-id: http://svn.code.sf.net/p/iso2mesh/code/trunk/jsonlab@468 786e58fb-9377-0410-9ff7-e4ac0ac0635c

Author: fangq

examples/jsonlab_basictest.matlab

@@ -281,11 +281,7 @@ json2data =
 ans =
 
 {
-	"empty_0by0_real": {
-		"_ArrayType_": "double",
-		"_ArraySize_": [0,0],
-		"_ArrayData_": null
-	}
+	"empty_0by0_real": null
 }
 
 

savejson.m

@@ -302,7 +302,7 @@
 sep=ws.sep;
 
 if(length(size(item))>2 || issparse(item) || ~isreal(item) || ...
-   isempty(item) ||jsonopt('ArrayToStruct',0,varargin{:}))
+   (isempty(item) && any(size(item))) ||jsonopt('ArrayToStruct',0,varargin{:}))
     if(isempty(name))
     	txt=sprintf('%s{%s%s"_ArrayType_": "%s",%s%s"_ArraySize_": %s,%s',...
               padding1,nl,padding0,class(item),nl,padding0,regexprep(mat2str(size(item)),'\s+',','),nl);