Steps to Reproduce:
- goto the Monitor > Schedules page of any resource
- check a metric and enter a collection interval with a fractional amout (e.g.  1.5 Minutes) and click "Set"
The exception below is thrown:

Suggestion:
1. First verify a positive numeric value is supplied for collection interval
2. Verify that the value is greater than or equal to 30 seconds (since that appears to be the minumum interval time allowed)
3. Process the collection interval supplied by converting it into seconds and then taking the integer value.  In this way, if the user enters 1.5 Minutes, then its conversion to 90 seconds would be a valid collection interval.

HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.IllegalStateException: Required request parameter 'durationComponentValue' is missing.
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)
	org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:532)
	org.rhq.enterprise.gui.legacy.WebUserTrackingFilter.doFilter(WebUserTrackingFilter.java:47)
	org.rhq.enterprise.gui.legacy.AuthenticationFilter.doFilter(AuthenticationFilter.java:129)
	org.rhq.enterprise.gui.common.upload.MultipartFilter.doFilter(MultipartFilter.java:63)
	org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
	org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:38)
	org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)