Ancora qualche correzione al codice per generare checksum.

loaih/build.py

@@ -382,6 +382,7 @@ class Build(loaih.RemoteBuild):
         os.chdir(self.appnamedir)
         for arch in self.arch:
             for item in [ self.appimagefilename[arch], self.zsyncfilename[arch] ]:
+                if self.built[arch]:
                     # For any built arch, find out if a file exist.
                     self.__create_checksum__(item)
 
@@ -390,7 +391,9 @@ class Build(loaih.RemoteBuild):
         """Internal function to create checksum file."""
 
         checksum = hashlib.md5()
+        fullpath = os.path.join(self.appnamedir, file)
 
+        if os.path.exists(fullpath):
             with open(os.path.join(self.appnamedir, file), 'rb') as readfile:
                 for chunk in iter(lambda: readfile.read(4096), b""):
                     checksum.update(chunk)