Support legacy default "pathToJest" setting

Author: seanpoulter

src/Settings/index.test.ts

@@ -6,6 +6,10 @@ describe('isDefaultPathToJest', () => {
     expect(isDefaultPathToJest(null)).toBe(true)
   })
 
+  it('returns true for the legacy default ""', () => {
+    expect(isDefaultPathToJest('')).toBe(true)
+  })
+
   it('returns false otherwise', () => {
     expect(isDefaultPathToJest('')).toBe(false)
   })

src/Settings/index.ts

@@ -19,7 +19,7 @@ export interface IPluginSettings {
 }
 
 export function isDefaultPathToJest(str) {
-  return str === null
+  return str === null || str === ''
 }
 
 export function hasUserSetPathToJest(str) {