bug(match2, dota): match links processing

[hjpalpha]

from discord:

Bug on Match2 on Dota 2 - https://liquipedia.net/dota2/User:X42bn6/Sandbox/Match2_bug

We input match IDs to link to Dotabuff, Stratz, etc. which have more detailed info (these are the icons below the games when we expand a series). However, sometimes, the matches don't get recorded on Valve's side due to server issues, so we can't input a match ID in these cases. But if the missing match ID is anything but the first match ID, it hides the Dotabuff/Stratz links for the subsequent match IDs. As a workaround, we can enter a dummy match ID like -1, but it would be ideal to not need to do this.