bar: guard against invalid base items

Author: n-riesco

src/traces/bar/calc.js

@@ -25,13 +25,15 @@ module.exports = function calc(gd, trace) {
     var xa = Axes.getFromId(gd, trace.xaxis || 'x'),
         ya = Axes.getFromId(gd, trace.yaxis || 'y'),
         orientation = trace.orientation || ((trace.x && !trace.y) ? 'h' : 'v'),
-        pos, size, i;
+        sa, pos, size, i;
 
     if(orientation === 'h') {
+        sa = xa;
         size = xa.makeCalcdata(trace, 'x');
         pos = ya.makeCalcdata(trace, 'y');
     }
     else {
+        sa = ya;
         size = ya.makeCalcdata(trace, 'y');
         pos = xa.makeCalcdata(trace, 'x');
     }
@@ -53,18 +55,21 @@ module.exports = function calc(gd, trace) {
     }
 
     // set base
-    var base = trace.base;
+    var base = trace.base,
+        b;
 
     if(Array.isArray(base)) {
         for(i = 0; i < Math.min(base.length, cd.length); i++) {
-            cd[i].b = base[i];
+            b = sa.d2c(base[i]);
+            cd[i].b = (isNumeric(b)) ? b : 0;
         }
         for(; i < cd.length; i++) {
             cd[i].b = 0;
         }
     }
     else {
-        var b = (base === undefined) ? 0 : base;
+        b = sa.d2c(base);
+        b = (isNumeric(b)) ? b : 0;
         for(i = 0; i < cd.length; i++) {
             cd[i].b = b;
         }