restrict labelalias to be plain object and hasOwnProperty

Author: archmoj

src/plots/cartesian/axes.js

@@ -1660,7 +1660,7 @@ axes.tickText = function(ax, x, hover, noSuffixPrefix) {
         if(ax.ticksuffix && !isHidden(ax.showticksuffix)) out.text += ax.ticksuffix;
     }
 
-    if(ax.labelalias) {
+    if(ax.labelalias && ax.labelalias.hasOwnProperty(out.text)) {
         var t = ax.labelalias[out.text];
         if(typeof t === 'string') out.text = t;
     }

src/plots/cartesian/tick_label_defaults.js

@@ -9,7 +9,8 @@ var handleArrayContainerDefaults = require('../array_container_defaults');
 module.exports = function handleTickLabelDefaults(containerIn, containerOut, coerce, axType, options) {
     if(!options) options = {};
 
-    coerce('labelalias');
+    var labelalias = coerce('labelalias');
+    if(!Lib.isPlainObject(labelalias)) delete containerOut.labelalias;
 
     var showAttrDflt = getShowAttrDflt(containerIn);