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This is the same issue as bug 1143771 but, in this case, it's a regression as the link was there previously (see the initial comment on that bug).

Without a /usr/lib/jvm/java-1.7.0-openjdk, there is no way to find OpenJDK 7 on RHEL 6.

I would avoid word regression. It was change on demand:
 https://bugzilla.redhat.com/show_bug.cgi?id=1259241 (https://bugzilla.redhat.com/show_bug.cgi?id=1254197)
 https://bugzilla.redhat.com/show_bug.cgi?id=1217177

Isuse is, that original convention was link depending on arch:
32b - java-1.x.0-openjdk
64b - java-1.x.0-openjdk.arch
 
With start of "multipe jdks" this changed, and  only  java-1.x.0-openjdk appeared as alterantives driven simlink between java-1.x.0-openjdk.

So this Should be regression only on 32b systems.

For record: https://bugzilla.redhat.com/show_bug.cgi?id=1143771:  1143771 - Missing /usr/lib/jvm/java-1.6.0-openjdk