Update c3.js and c3.min.js

c3.js

@@ -1715,7 +1715,10 @@
     };
     c3_chart_internal_fn.getYDomain = function (targets, axisId, xDomain) {
         var $$ = this, config = $$.config,
-            targetsByAxisId = targets.filter(function (t) { return $$.getAxisId(t.id) === axisId; }),
+            targetsByAxisId = targets.filter(function (t) { 
+                if($$.getAxisId(t.id) !== axisId) return false;
+                return !!t.values.length;
+            }),
             yTargets = xDomain ? $$.filterByXDomain(targetsByAxisId, xDomain) : targetsByAxisId,
             yMin = axisId === 'y2' ? config.axis_y2_min : config.axis_y_min,
             yMax = axisId === 'y2' ? config.axis_y2_max : config.axis_y_max,
@@ -2025,9 +2028,10 @@
     };
     c3_chart_internal_fn.getEdgeX = function (targets) {
         var $$ = this;
-        return !targets.length ? [0, 0] : [
-            $$.d3.min(targets, function (t) { return t.values[0].x; }),
-            $$.d3.max(targets, function (t) { return t.values[t.values.length - 1].x; })
+        var filtered = targets.filter(function(t){ return !!t.values.length; });
+        return !filtered.length ? [0, 0] : [
+            $$.d3.min(filtered, function (t) { return t.values[0].x; }),
+            $$.d3.max(filtered, function (t) { return t.values[t.values.length - 1].x; })
         ];
     };
     c3_chart_internal_fn.mapToIds = function (targets) {
@@ -2344,6 +2348,13 @@
                 new_rows[j - 1][key] = columns[i][j];
             }
         }
+        if(!new_rows.length){
+            new_rows.empty = true;
+            new_rows[0] = {};
+            for (i = 0; i < columns.length; i++) {
+                new_rows[0][columns[i][0]] = undefined;
+            }
+        }
         return new_rows;
     };
     c3_chart_internal_fn.convertDataToTargets = function (data, appendXs) {