pySim-shell_test/utils: print logfile on all types of errors

When pySim-shell has problems starting up, it exits with an error
code. This is detected by the testsuite, but it also causes an
early exit, so that the log file content are not printed.

Change-Id: Ic0f34eda32a7c557810abcb05a84e343741fdb8a

tests/pySim-shell_test/utils.py

@@ -265,11 +265,9 @@ class UnittestUtils(unittest.TestCase):
         # Execute commandline
         cmdline += " > " + logfile_name + " 2>&1"
         print("Executing: " + cmdline)
-        rc = os.system(cmdline)
-        if rc:
-            raise RuntimeError("pySim-shell exits with error code %u" % rc)
+        py_sim_shell_rc = os.system(cmdline)
 
-        # Check for exceptions
+        # Read logfile
         logfile = open(logfile_name)
         logfile_content = logfile.read()
         if self.print_content:
@@ -278,6 +276,12 @@ class UnittestUtils(unittest.TestCase):
             print(logfile_content)
             print("-----------------------8<-----------------------")
         logfile.close()
+
+        # Exit early in case pySim-shell ran into a fundamental error
+        if py_sim_shell_rc:
+            raise RuntimeError("pySim-shell exits with error code %u" % py_sim_shell_rc)
+
+        # Check log for exceptions
         exception_regex_compiled = re.compile('.*EXCEPTION.*')
         exceptions_strings = re.findall(exception_regex_compiled, logfile_content)
         if exceptions_strings != []: