fix(bin/linja): only strip flycheck message in linja

Removing empty lines for FlyCheck messages was added by
4266b8c7a3. We had somecases where
Flycheck messages start with an empty line instead of `FLYCHECK_BEGIN
ERROR` in Windows7 + Python2 env. I think it's because of the different
newline character problem (LF, LFCR). My solution was to remove all
empty lines, which was too much. Now, I think striping should be enoguh.

fix #512

bin/linja.in

@@ -133,8 +133,7 @@ class FlycheckItem:
         return (self.filename, self.ty, self.lineno, self.colno)
     @classmethod
     def fromString(cls, target, text):
-        # Filter out empty lines
-        lines     = [line for line in text.splitlines() if len(line) > 0]
+        lines     = text.strip().splitlines()
         # Throw the first and last lines (header/footer)
         lines     = lines[1:-1]
         try: