make extra shared file list appear only when non empty

libretroshare/src/file_sharing/p3filelists.cc

@@ -1078,6 +1078,8 @@ int p3FileDatabase::RequestDirDetails(void *ref, DirDetails& d, FileSearchFlags
             stub.ref  = p;
             d.children.push_back(stub);
 			}
+
+            if(mExtraFiles->size() > 0)
             {
             convertEntryIndexToPointer<sizeof(void*)>(0,1,p);	// local shared files from extra list
             DirStub stub;

libretroshare/src/ft/ftextralist.h

@@ -122,6 +122,8 @@ public:
 	                          std::string destpath);
 
 
+    uint32_t    size() const { return mFiles.size() ; }
+
 	/***
 		 * Hash file, and add to the files,
 		 * file is removed after period.