generic graph add method samll mistake fixed

Author: nisabmohd

build/classes/Graphs/GraphGeneric.class

@@ -2,8 +2,6 @@
 <project-private xmlns="http://www.netbeans.org/ns/project-private/1">
     <editor-bookmarks xmlns="http://www.netbeans.org/ns/editor-bookmarks/2" lastBookmarkId="0"/>
     <open-files xmlns="http://www.netbeans.org/ns/projectui-open-files/2">
-        <group>
-            <file>file:/C:/Users/nisab/Desktop/Java/JavaApplication5/src/Queues/CircularQueue.java</file>
-        </group>
+        <group/>
     </open-files>
 </project-private>

nbproject/private/private.xml

@@ -16,7 +16,7 @@ public void addEdge(T start, T end) {
             map.put(start, new ArrayList<>());
             return;
         }
-        if (end == null && start != null) {
+        if (start == null && end != null) {
             map.put(end, new ArrayList<>());
             return;
         }