fix(graph): Fix so that zoom works even when no data exists, fixes #5570

public/vendor/flot/jquery.flot.selection.js

@@ -94,11 +94,11 @@ The plugin allso adds the following methods to the plot object:
         var savedhandlers = {};
 
         var mouseUpHandler = null;
-        
+
         function onMouseMove(e) {
             if (selection.active) {
                 updateSelection(e);
-                
+
                 plot.getPlaceholder().trigger("plotselecting", [ getSelection() ]);
             }
         }
@@ -106,7 +106,7 @@ The plugin allso adds the following methods to the plot object:
         function onMouseDown(e) {
             if (e.which != 1)  // only accept left-click
                 return;
-            
+
             // cancel out any text selections
             document.body.focus();
 
@@ -127,13 +127,13 @@ The plugin allso adds the following methods to the plot object:
             // this is a bit silly, but we have to use a closure to be
             // able to whack the same handler again
             mouseUpHandler = function (e) { onMouseUp(e); };
-            
+
             $(document).one("mouseup", mouseUpHandler);
         }
 
         function onMouseUp(e) {
             mouseUpHandler = null;
-            
+
             // revert drag stuff for old-school browsers
             if (document.onselectstart !== undefined)
                 document.onselectstart = savedhandlers.onselectstart;
@@ -158,13 +158,22 @@ The plugin allso adds the following methods to the plot object:
         function getSelection() {
             if (!selectionIsSane())
                 return null;
-            
+
             if (!selection.show) return null;
 
             var r = {}, c1 = selection.first, c2 = selection.second;
-            $.each(plot.getAxes(), function (name, axis) {
-                if (axis.used) {
-                    var p1 = axis.c2p(c1[axis.direction]), p2 = axis.c2p(c2[axis.direction]); 
+            var axes = plot.getAxes();
+            // look if no axis is used
+            var noAxisInUse = true;
+            $.each(axes, function (name, axis) {
+              if (axis.used) {
+                anyUsed = false;
+              }
+            })
+
+            $.each(axes, function (name, axis) {
+                if (axis.used || noAxisInUse) {
+                    var p1 = axis.c2p(c1[axis.direction]), p2 = axis.c2p(c2[axis.direction]);
                     r[name] = { from: Math.min(p1, p2), to: Math.max(p1, p2) };
                 }
             });
@@ -252,10 +261,10 @@ The plugin allso adds the following methods to the plot object:
                 from = to;
                 to = tmp;
             }
-            
+
             return { from: from, to: to, axis: axis };
         }
-        
+
         function setSelection(ranges, preventEvent) {
             var axis, range, o = plot.getOptions();
 
@@ -333,11 +342,11 @@ The plugin allso adds the following methods to the plot object:
                 ctx.restore();
             }
         });
-        
+
         plot.hooks.shutdown.push(function (plot, eventHolder) {
             eventHolder.unbind("mousemove", onMouseMove);
             eventHolder.unbind("mousedown", onMouseDown);
-            
+
             if (mouseUpHandler)
                 $(document).unbind("mouseup", mouseUpHandler);
         });