tools: Don't error out of insertkeys script on whitespace

Many keys end with whitespace or otherwise have whitespace separating the
certificates.  If insertkeys is intended to support multiple certificates, we
should also support blank line separators.

Change-Id: I5fd17be5785ad1b89a6191e9ba33bbc7c5a4e8e9

tools/insertkeys.py

@@ -79,7 +79,8 @@ class GenerateKeys(object):
 
             # If we haven't started the certificate, then we should not encounter any data
             elif not inCert:
-                sys.exit("Detected erroneous line \""+ line + "\" on " + str(lineNo)
+                if line is not "":
+                    sys.exit("Detected erroneous line \""+ line + "\" on " + str(lineNo)
                         + " in pem file: " + path)
 
             # else we have started the certicate and need to append the data