java.lang.NumberFormatException When Configuring IQ Server via Capabilities

When configuring IQ Server settings via 'Capabilities --> IQ: Server Configuration', a java.lang.NumberFormatException is thrown when saving the settings form.

1. To reproduce, configure an 'IQ: Server Configuration' capability.

2. Fill in all the required fields but leave the 'request timeout' field blank. 

3. Save config.

Expected:

Config should be saved and Request Timeout should take default global settings.

Actual:

java.lang.NumberFormatException is thrown:

2019-04-09 13:45:10,319+0100 ERROR [qtp1648621026-5318] admin org.sonatype.nexus.extdirect.internal.ExtDirectExceptionHandler - Failed to invoke action method: capability_Capability.update, java-method: org.sonatype.nexus.coreui.internal.capability.CapabilityComponent.update
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:592)
at java.lang.Integer.valueOf(Integer.java:766)
at com.sonatype.nexus.clm.ClmConfiguration.parseTimeout(ClmConfiguration.java:198)
at com.sonatype.nexus.clm.ClmConfiguration.<init>(ClmConfiguration.java:85)
at com.sonatype.nexus.clm.internal.capability.ClmCapabilityDescriptor.createConfig(ClmCapabilityDescriptor.java:164)
at com.sonatype.nexus.clm.internal.capability.ClmCapabilityDescriptor.createConfig(ClmCapabilityDescriptor.java:1)
at org.sonatype.nexus.capability.CapabilityDescriptorSupport.validateConfig(CapabilityDescriptorSupport.java:154)
at org.sonatype.nexus.capability.CapabilityDescriptorSupport.validate(CapabilityDescriptorSupport.java:125)
at org.sonatype.nexus.internal.capability.DefaultCapabilityRegistry.update(DefaultCapabilityRegistry.java:208)
at org.sonatype.nexus.capability.CapabilityRegistry$update$1.call(Unknown Source)
at org.sonatype.nexus.coreui.internal.capability.CapabilityComponent.update(CapabilityComponent.groovy:151)

Workaround/Alternative

Configure IQ Server via the IQ Server -> Server UI page.