Check to see that text is not None before calling replace in write(). (…

…#262)

Error: 'NoneType' object has no attribute 'replace'

codecov/__init__.py

@@ -147,7 +147,7 @@ def sanitize_arg(replacement, arg):
 
 def write(text, color=None):
     global COLOR
-    if COLOR:
+    if text and COLOR:
         text = text.replace("==>", "\033[90m==>\033[0m")
         text = text.replace("    +", "    \033[32m+\033[0m")
         text = text.replace("XX>", "\033[31mXX>\033[0m")
@@ -174,7 +174,8 @@ def write(text, color=None):
         elif color == "green":
             text = "\033[92m%s\033[0m" % text
 
-    sys.stdout.write(text + "\n")
+    if text:
+        sys.stdout.write(text + "\n")
 
 
 def fopen(path):