Don't put spurious leading semicolon in param doc when Param.allowed_types is empty
When expanding these templates, param.type is empty if the type is not specified for that Param in the StarlarkMethod annotation. For example, that's currently showing up for many of the params on attr methods:
RELNOTES: None.
@@ -57,10 +57,13 @@ ${module.documentation}
<code>${param.name}</code>
</td>
<td>
+ #if (!$param.type.isEmpty())
+ <code>${param.type}</code>;
+ #end
#if (!$param.defaultValue.isEmpty())
- <code>${param.type}</code>; default = ${param.defaultValue}<br/>
+ default = ${param.defaultValue}<br/>
#else
- <code>${param.type}</code>; required<br/>
+ required<br/>
#end
${param.documentation}
</td>
