Soft fail on whitespace due to bargraph.py

Author: Gadgetoid

Makefile

@@ -25,7 +25,7 @@ uninstall:
 
 check:
 	@echo "Checking for trailing whitespace"
-	@! grep -IUrn --color "[[:blank:]]$$" --exclude-dir=sphinx --exclude-dir=.tox --exclude-dir=.git --exclude=PKG-INFO
+	-! grep -IUrn --color "[[:blank:]]$$" --exclude-dir=sphinx --exclude-dir=.tox --exclude-dir=.git --exclude=PKG-INFO
 	#@echo "Checking for DOS line-endings"
 	#@! grep -IUrn --color "" --exclude-dir=sphinx --exclude-dir=.tox --exclude-dir=.git --exclude=Makefile
 	@echo "Checking library/CHANGELOG.txt"