Fixed test

nw/config.py

@@ -317,7 +317,10 @@ class Config:
         return True
 
     def setLastPath(self, lastPath):
-        self.lastPath = path.dirname(lastPath)
+        if lastPath is None or lastPath == "":
+            self.lastPath = ""
+        else:
+            self.lastPath = path.dirname(lastPath)
         return True
 
     def setWinSize(self, newWidth, newHeight):

tests/reference/novelwriter.conf

@@ -37,6 +37,7 @@ backuponclose = False
 askbeforebackup = True
 
 [Path]
+lastpath = 
 recent0 = 
 recent1 = 
 recent2 = 

tests/test_config.py

@@ -14,6 +14,8 @@ def testConfigInit(nwTemp,nwRef):
     tmpConf = path.join(nwTemp,"novelwriter.conf")
     refConf = path.join(nwRef, "novelwriter.conf")
     assert theConf.initConfig(nwTemp)
+    assert theConf.setLastPath("")
+    assert theConf.saveConfig()
     assert cmpFiles(tmpConf, refConf, [2])
     assert not theConf.confChanged