leverage cash when no dates passed in

client/dashboard/layout/layout.js

@@ -61,7 +61,6 @@ var Layout = React.createClass({
         request = house.ensureEnergyData();
       }
       request.then(()=>{
-        console.log('data retrieved')
         layout.setState({requesting_data: false}, ()=>{
           console.log(layout.state.requesting_data);
         });

client/models/house.js

@@ -40,6 +40,7 @@ class House {
     }
 
     query_ranges = MathUtil.minusRange([opts.start_date, opts.end_date], [min_date, max_date]);
+    if (!query_ranges) return Promise.resolve(house.power_data);
 
     cache = ArrayUtil.selectMap(date_range, (datum_time)=>{
       return ArrayUtil.all(query_ranges, (query_range)=>{
@@ -83,6 +84,7 @@ class House {
     if (date_range.length === 0) return house.getEnergyData({dates: [[opts.start_date, opts.end_date]]})
 
     query_ranges = MathUtil.minusRange([opts.start_date, opts.end_date], [min_date, max_date]);
+    if (!query_ranges) return Promise.resolve(house.power_data);
 
     cache = ArrayUtil.selectMap(date_range, (datum_day)=>{
       return ArrayUtil.all(query_ranges, (query_range)=>{

shared/utils/math.js

@@ -12,6 +12,10 @@ export default class {
   // returns array of array length two, representing mins and maxes not within min_max2.
   static minusRange(min_max1, min_max2){
     var minus = [];
+
+    // return undefined if min_max1 not provided
+    if (!min_max1 || (!min_max1[0] && !min_max2[1])) return undefined;
+
     if (min_max1[0] >= min_max2[0]){
       if (min_max1[1] > min_max2[1]) minus.push([min_max2[1], min_max1[1]]);
     } else if (min_max1[1] <= min_max2[1]){