[Telemetry] Consider linux distribution number is 0 when it cannot be parsed

tools/telemetry/telemetry/core/platform/linux_platform_backend.py

Index: tools/telemetry/telemetry/core/platform/linux_platform_backend.py
diff --git a/tools/telemetry/telemetry/core/platform/linux_platform_backend.py b/tools/telemetry/telemetry/core/platform/linux_platform_backend.py
index 71c68bbfbe859528adee4187a26dd6c39c1932e9..97ea60125fb2b10842fbe98050729bd09ac41fe4 100644
--- a/tools/telemetry/telemetry/core/platform/linux_platform_backend.py
+++ b/tools/telemetry/telemetry/core/platform/linux_platform_backend.py
@@ -51,6 +51,10 @@ class LinuxPlatformBackend(
           codename = value.strip()
         elif key == 'DISTRIB_RELEASE':
           version = float(value)

[tonyg, 2014/07/11 02:33:45]

I think you meant to remove this line.

That kind of points out that this should be unittested. There are some examples
here of how to mock out the contents of /etc/lsb-release to test the output
you're concerned with.

https://code.google.com/p/chromium/codesearch#chromium/src/tools/telemetry/te...

+          try:
+            version = float(value)
+          except ValueError:
+            version = 0
         if codename and version:
           break
     return platform_backend.OSVersion(codename, version)