fix(priceRanges): avoid displaying solo ranges (#1544)

fixes #1536

Author: vvo

src/widgets/price-ranges/__tests__/generate-ranges-test.js

@@ -57,4 +57,9 @@ describe('generateRanges()', () => {
     const stats = {min: 20, max: 20, avg: 20, sum: 20};
     expect(generateRanges(stats)).toEqual([]);
   });
+
+  it('should not generate ranges', () => {
+    const stats = {min: 6765, max: 6765, avg: 6765, sum: 6765};
+    expect(generateRanges(stats)).toEqual([]);
+  });
 });

src/widgets/price-ranges/generate-ranges.js

@@ -7,6 +7,11 @@ function round(v, precision) {
 }
 
 function generateRanges(stats) {
+  // cannot compute any range
+  if (stats.min === stats.max) {
+    return [];
+  }
+
   let precision;
   if (stats.avg < 100) {
     precision = 1;