Fix a math issue

Infinity was being returned as the min and max when the price for 
Saturday PM was entered. Instead, we should just return the Saturday PM 
price for both since that sort of reflects the rest of the week, even if 
it's just a few more hours.

js/predictions.js

@@ -204,8 +204,8 @@ class PDF {
     }
 
     let prob = 0;
-    const start_idx = Math.round(start) - this.value_start; 
-    const end_idx = Math.round(end) - this.value_start; 
+    const start_idx = Math.round(start) - this.value_start;
+    const end_idx = Math.round(end) - this.value_start;
     for (let i = start_idx; i <= end_idx; i++) {
       const bucket_prob = this.prob[i] * range_intersect_length(this.range_of(i), range);
       this.prob[i] = bucket_prob;
@@ -838,6 +838,10 @@ function analyze_possibilities(sell_prices, first_buy, previous_pattern) {
         weekMaxes = [];
       }
     }
+    if (!weekMins.length && !weekMaxes.length) {
+      weekMins.push(poss.prices[poss.prices.length -1].min);
+      weekMaxes.push(poss.prices[poss.prices.length -1].max);
+    }
     poss.weekGuaranteedMinimum = Math.max(...weekMins);
     poss.weekMax = Math.max(...weekMaxes);
   }